update ast 8.6.2

1 files changed, 0 insertions, 2327 deletions

diff --git a/ast/tranmap.c b/ast/tranmap.c
deleted file mode 100644
index 5abd75d..0000000
--- a/ast/tranmap.c
+++ /dev/null
@@ -1,2327 +0,0 @@
-/*
-*class++
-*  Name:
-*     TranMap
-
-*  Purpose:
-*     Mapping with specified forward and inverse transformations.
-
-*  Constructor Function:
-c     astTranMap
-f     AST_TRANMAP
-
-*  Description:
-*     A TranMap is a Mapping which combines the forward transformation of
-*     a supplied Mapping with the inverse transformation of another
-*     supplied Mapping, ignoring the un-used transformation in each
-*     Mapping (indeed the un-used transformation need not exist).
-*
-*     When the forward transformation of the TranMap is referred to, the
-*     transformation actually used is the forward transformation of the
-*     first Mapping supplied when the TranMap was constructed. Likewise,
-*     when the inverse transformation of the TranMap is referred to, the
-*     transformation actually used is the inverse transformation of the
-*     second Mapping supplied when the TranMap was constructed.
-
-*  Inheritance:
-*     The TranMap class inherits from the Mapping class.
-
-*  Attributes:
-*     The TranMap class does not define any new attributes beyond those
-*     which are applicable to all Mappings.
-
-*  Functions:
-c     The TranMap class does not define any new functions beyond those
-f     The TranMap class does not define any new routines beyond those
-*     which are applicable to all Mappings.
-
-*  Copyright:
-*     Copyright (C) 1997-2006 Council for the Central Laboratory of the
-*     Research Councils
-
-*  Licence:
-*     This program is free software: you can redistribute it and/or
-*     modify it under the terms of the GNU Lesser General Public
-*     License as published by the Free Software Foundation, either
-*     version 3 of the License, or (at your option) any later
-*     version.
-*     
-*     This program is distributed in the hope that it will be useful,
-*     but WITHOUT ANY WARRANTY; without even the implied warranty of
-*     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-*     GNU Lesser General Public License for more details.
-*     
-*     You should have received a copy of the GNU Lesser General
-*     License along with this program.  If not, see
-*     <http://www.gnu.org/licenses/>.
-
-*  Authors:
-*     DSB: David S. Berry (Starlink)
-
-*  History:
-*     10-FEB-2004 (DSB):
-*        Original version.
-*     19-JAN-2005 (DSB):
-*        Fix memory leak.
-*     14-FEB-2006 (DSB):
-*        - Over-ride the astDecompose method.
-*        - Fix bug in MapSplit related to use of invert flags.
-*     14-FEB-2006 (DSB):
-*        Override astGetObjSize.
-*     10-MAY-2006 (DSB):
-*        Override astEqual.
-*class--
-*/
-
-/* Module Macros. */
-/* ============== */
-/* Set the name of the class we are implementing. This indicates to
-   the header files that define class interfaces that they should make
-   "protected" symbols available. */
-#define astCLASS TranMap
-
-/* Include files. */
-/* ============== */
-/* Interface definitions. */
-/* ---------------------- */
-
-#include "globals.h"             /* Thread-safe global data access */
-#include "error.h"               /* Error reporting facilities */
-#include "memory.h"              /* Memory allocation facilities */
-#include "object.h"              /* Base Object class */
-#include "pointset.h"            /* Sets of points/coordinates */
-#include "mapping.h"             /* Coordinate Mappings (parent class) */
-#include "channel.h"             /* I/O channels */
-#include "permmap.h"             /* Coordinate permutation Mappings */
-#include "cmpmap.h"              /* Compound Mappings */
-#include "unitmap.h"             /* Unit Mappings */
-#include "tranmap.h"             /* Interface definition for this class */
-#include "frame.h"               /* Frames */
-
-/* Error code definitions. */
-/* ----------------------- */
-#include "ast_err.h"             /* AST error codes */
-
-/* C header files. */
-/* --------------- */
-#include <stdarg.h>
-#include <stddef.h>
-#include <string.h>
-#include <stdio.h>
-
-/* Module Variables. */
-/* ================= */
-
-/* Address of this static variable is used as a unique identifier for
-   member of this class. */
-static int class_check;
-
-/* Pointers to parent class methods which are extended by this class. */
-static int (* parent_getobjsize)( AstObject *, int * );
-static AstPointSet *(* parent_transform)( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static int *(* parent_mapsplit)( AstMapping *, int, const int *, AstMapping **, int * );
-
-#if defined(THREAD_SAFE)
-static int (* parent_managelock)( AstObject *, int, int, AstObject **, int * );
-#endif
-
-
-
-#ifdef THREAD_SAFE
-/* Define how to initialise thread-specific globals. */
-#define GLOBAL_inits \
-   globals->Class_Init = 0;
-
-/* Create the function that initialises global data for this module. */
-astMAKE_INITGLOBALS(TranMap)
-
-/* Define macros for accessing each item of thread specific global data. */
-#define class_init astGLOBAL(TranMap,Class_Init)
-#define class_vtab astGLOBAL(TranMap,Class_Vtab)
-
-
-#include <pthread.h>
-
-
-#else
-
-
-/* Define the class virtual function table and its initialisation flag
-   as static variables. */
-static AstTranMapVtab class_vtab;   /* Virtual function table */
-static int class_init = 0;       /* Virtual function table initialised? */
-
-#endif
-
-/* External Interface Function Prototypes. */
-/* ======================================= */
-/* The following functions have public prototypes only (i.e. no
-   protected prototypes), so we must provide local prototypes for use
-   within this module. */
-AstTranMap *astTranMapId_( void *, void *, const char *, ... );
-
-/* Prototypes for Private Member Functions. */
-/* ======================================== */
-static AstMapping *RemoveRegions( AstMapping *, int * );
-static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static double Rate( AstMapping *, double *, int, int, int * );
-static int *MapSplit( AstMapping *, int, const int *, AstMapping **, int * );
-static int Equal( AstObject *, AstObject *, int * );
-static int MapMerge( AstMapping *, int, int, int *, AstMapping ***, int **, int * );
-static void Copy( const AstObject *, AstObject *, int * );
-static void Delete( AstObject *, int * );
-static void Dump( AstObject *, AstChannel *, int * );
-static void Decompose( AstMapping *, AstMapping **, AstMapping **, int *, int *, int *, int * );
-static int GetObjSize( AstObject *, int * );
-
-#if defined(THREAD_SAFE)
-static int ManageLock( AstObject *, int, int, AstObject **, int * );
-#endif
-
-
-/* Member functions. */
-/* ================= */
-static int Equal( AstObject *this_object, AstObject *that_object, int *status ) {
-/*
-*  Name:
-*     Equal
-
-*  Purpose:
-*     Test if two TranMaps are equivalent.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     int Equal( AstObject *this, AstObject *that, int *status )
-
-*  Class Membership:
-*     TranMap member function (over-rides the astEqual protected
-*     method inherited from the astMapping class).
-
-*  Description:
-*     This function returns a boolean result (0 or 1) to indicate whether
-*     two TranMaps are equivalent.
-
-*  Parameters:
-*     this
-*        Pointer to the first Object (a TranMap).
-*     that
-*        Pointer to the second Object.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     One if the TranMaps are equivalent, zero otherwise.
-
-*  Notes:
-*     - A value of zero will be returned if this function is invoked
-*     with the global status set, or if it should fail for any reason.
-*/
-
-/* Local Variables: */
-   AstTranMap *that;
-   AstTranMap *this;
-   int nin;
-   int nout;
-   int result;
-   int that_inv1;
-   int that_inv2;
-   int this_inv1;
-   int this_inv2;
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain pointers to the two TranMap structures. */
-   this = (AstTranMap *) this_object;
-   that = (AstTranMap *) that_object;
-
-/* Check the second object is a TranMap. We know the first is a
-   TranMap since we have arrived at this implementation of the virtual
-   function. */
-   if( astIsATranMap( that ) ) {
-
-/* Get the number of inputs and outputs and check they are the same for both. */
-      nin = astGetNin( this );
-      nout = astGetNout( this );
-      if( astGetNin( that ) == nin && astGetNout( that ) == nout ) {
-
-/* Temporarily re-instate the original Invert flag values. */
-         that_inv1 = astGetInvert( that->map1 );
-         that_inv2 = astGetInvert( that->map2 );
-         this_inv1 = astGetInvert( this->map1 );
-         this_inv2 = astGetInvert( this->map2 );
-
-         astSetInvert( this->map1, this->invert1 );
-         astSetInvert( this->map2, this->invert2 );
-         astSetInvert( that->map1, that->invert1 );
-         astSetInvert( that->map2, that->invert2 );
-
-/* If the Invert flags for the two TranMaps differ, it may still be possible
-   for them to be equivalent. First compare the TranMaps if their Invert
-   flags are the same. In this case all the attributes of the two TranMaps
-   must be identical. */
-         if( astGetInvert( this ) == astGetInvert( that ) ) {
-            if( astEqual( this->map1, that->map1 ) &&
-                astEqual( this->map2, that->map2 ) ) {
-               result = 1;
-            }
-
-/* If the Invert flags for the two TranMaps differ, the attributes of the two
-   TranMaps must be inversely related to each other. */
-         } else {
-
-            astInvert( that->map1 );
-            astInvert( that->map2 );
-
-            if( astEqual( this->map1, that->map2 ) &&
-                astEqual( this->map2, that->map1 ) ) {
-               result = 1;
-            }
-
-         }
-
-/* Restore the original Invert flag values. */
-         astSetInvert( this->map1, this_inv1 );
-         astSetInvert( this->map2, this_inv2 );
-         astSetInvert( that->map1, that_inv1 );
-         astSetInvert( that->map2, that_inv2 );
-      }
-   }
-
-/* If an error occurred, clear the result value. */
-   if ( !astOK ) result = 0;
-
-/* Return the result, */
-   return result;
-}
-
-static int GetObjSize( AstObject *this_object, int *status ) {
-/*
-*  Name:
-*     GetObjSize
-
-*  Purpose:
-*     Return the in-memory size of an Object.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     int GetObjSize( AstObject *this, int *status )
-
-*  Class Membership:
-*     TranMap member function (over-rides the astGetObjSize protected
-*     method inherited from the parent class).
-
-*  Description:
-*     This function returns the in-memory size of the supplied TranMap,
-*     in bytes.
-
-*  Parameters:
-*     this
-*        Pointer to the TranMap.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     The Object size, in bytes.
-
-*  Notes:
-*     - A value of zero will be returned if this function is invoked
-*     with the global status set, or if it should fail for any reason.
-*/
-
-/* Local Variables: */
-   AstTranMap *this;         /* Pointer to TranMap structure */
-   int result;                /* Result value to return */
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain a pointers to the TranMap structure. */
-   this = (AstTranMap *) this_object;
-
-/* Invoke the GetObjSize method inherited from the parent class, and then
-   add on any components of the class structure defined by thsi class
-   which are stored in dynamically allocated memory. */
-   result = (*parent_getobjsize)( this_object, status );
-   result += astGetObjSize( this->map1 );
-   result += astGetObjSize( this->map2 );
-
-/* If an error occurred, clear the result value. */
-   if ( !astOK ) result = 0;
-
-/* Return the result, */
-   return result;
-}
-
-static void Decompose( AstMapping *this_mapping, AstMapping **map1,
-                       AstMapping **map2, int *series, int *invert1,
-                       int *invert2, int *status ) {
-/*
-*
-*  Name:
-*     Decompose
-
-*  Purpose:
-*     Decompose a Mapping into two component Mappings.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     void Decompose( AstMapping *this, AstMapping **map1,
-*                     AstMapping **map2, int *series,
-*                     int *invert1, int *invert2, int *status )
-
-*  Class Membership:
-*     TranMap member function (over-rides the protected astDecompose
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function returns pointers to the two Mappings encapsulated by
-*     a TranMap.
-
-*  Parameters:
-*     this
-*        Pointer to the Mapping.
-*     map1
-*        Address of a location to receive a pointer to first component
-*        Mapping (the forward Mapping).
-*     map2
-*        Address of a location to receive a pointer to second component
-*        Mapping (the inverse Mapping).
-*     series
-*        Address of a location to receive a value indicating if the
-*        component Mappings are applied in series or parallel. A non-zero
-*        value means that the supplied Mapping is equivalent to applying map1
-*        followed by map2 in series. A zero value means that the supplied
-*        Mapping is equivalent to applying map1 to the lower numbered axes
-*        and map2 to the higher numbered axes, in parallel. Zero is
-*        returned for a TranMap.
-*     invert1
-*        The value of the Invert attribute to be used with map1.
-*     invert2
-*        The value of the Invert attribute to be used with map2.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Notes:
-*     - Any changes made to the component Mappings using the returned
-*     pointers will be reflected in the supplied Mapping.
-
-*-
-*/
-
-
-/* Local Variables: */
-   AstTranMap *this;             /* Pointer to TranMap structure */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the TranMap structure. */
-   this = (AstTranMap *) this_mapping;
-
-/* If the TranMap has been inverted, return the Mappings in reverse
-   order with inverted Invert falgs. */
-   if( astGetInvert( this ) ) {
-      if( map1 ) *map1 = astClone( this->map2 );
-      if( map2 ) *map2 = astClone( this->map1 );
-      if( invert1 ) *invert1 = this->invert2 ? 0 : 1;
-      if( invert2 ) *invert2 = this->invert1 ? 0 : 1;
-
-/* If the TranMap has not been inverted, return the Mappings in their
-   original order with their original Invert flags. */
-   } else {
-      if( map1 ) *map1 = astClone( this->map1 );
-      if( map2 ) *map2 = astClone( this->map2 );
-      if( invert1 ) *invert1 = this->invert1;
-      if( invert2 ) *invert2 = this->invert2;
-   }
-}
-
-void astInitTranMapVtab_(  AstTranMapVtab *vtab, const char *name, int *status ) {
-/*
-*+
-*  Name:
-*     astInitTranMapVtab
-
-*  Purpose:
-*     Initialise a virtual function table for a TranMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     void astInitTranMapVtab( AstTranMapVtab *vtab, const char *name )
-
-*  Class Membership:
-*     TranMap vtab initialiser.
-
-*  Description:
-*     This function initialises the component of a virtual function
-*     table which is used by the TranMap class.
-
-*  Parameters:
-*     vtab
-*        Pointer to the virtual function table. The components used by
-*        all ancestral classes will be initialised if they have not already
-*        been initialised.
-*     name
-*        Pointer to a constant null-terminated character string which contains
-*        the name of the class to which the virtual function table belongs (it
-*        is this pointer value that will subsequently be returned by the Object
-*        astClass function).
-*-
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstObjectVtab *object;        /* Pointer to Object component of Vtab */
-   AstMappingVtab *mapping;      /* Pointer to Mapping component of Vtab */
-
-/* Check the local error status. */
-   if ( !astOK ) return;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Initialize the component of the virtual function table used by the
-   parent class. */
-   astInitMappingVtab( (AstMappingVtab *) vtab, name );
-
-/* Store a unique "magic" value in the virtual function table. This
-   will be used (by astIsATranMap) to determine if an object belongs to
-   this class.  We can conveniently use the address of the (static)
-   class_check variable to generate this unique value. */
-   vtab->id.check = &class_check;
-   vtab->id.parent = &(((AstMappingVtab *) vtab)->id);
-
-/* Initialise member function pointers. */
-/* ------------------------------------ */
-/* Store pointers to the member functions (implemented here) that
-   provide virtual methods for this class. */
-
-/* None. */
-
-/* Save the inherited pointers to methods that will be extended, and
-   replace them with pointers to the new member functions. */
-   object = (AstObjectVtab *) vtab;
-   mapping = (AstMappingVtab *) vtab;
-   parent_getobjsize = object->GetObjSize;
-   object->GetObjSize = GetObjSize;
-
-   mapping->RemoveRegions = RemoveRegions;
-
-#if defined(THREAD_SAFE)
-   parent_managelock = object->ManageLock;
-   object->ManageLock = ManageLock;
-#endif
-
-   parent_transform = mapping->Transform;
-   mapping->Transform = Transform;
-
-   parent_mapsplit = mapping->MapSplit;
-   mapping->MapSplit = MapSplit;
-
-/* Store replacement pointers for methods which will be over-ridden by
-   new member functions implemented here. */
-   object->Equal = Equal;
-   mapping->Decompose = Decompose;
-   mapping->MapMerge = MapMerge;
-   mapping->Rate = Rate;
-
-/* Declare the copy constructor, destructor and class dump function. */
-   astSetCopy( vtab, Copy );
-   astSetDelete( vtab, Delete );
-   astSetDump( vtab, Dump, "TranMap", "Compound Transformation Mapping" );
-
-/* If we have just initialised the vtab for the current class, indicate
-   that the vtab is now initialised, and store a pointer to the class
-   identifier in the base "object" level of the vtab. */
-   if( vtab == &class_vtab ) {
-      class_init = 1;
-      astSetVtabClassIdentifier( vtab, &(vtab->id) );
-   }
-}
-
-#if defined(THREAD_SAFE)
-static int ManageLock( AstObject *this_object, int mode, int extra,
-                       AstObject **fail, int *status ) {
-/*
-*  Name:
-*     ManageLock
-
-*  Purpose:
-*     Manage the thread lock on an Object.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "object.h"
-*     AstObject *ManageLock( AstObject *this, int mode, int extra,
-*                            AstObject **fail, int *status )
-
-*  Class Membership:
-*     TranMap member function (over-rides the astManageLock protected
-*     method inherited from the parent class).
-
-*  Description:
-*     This function manages the thread lock on the supplied Object. The
-*     lock can be locked, unlocked or checked by this function as
-*     deteremined by parameter "mode". See astLock for details of the way
-*     these locks are used.
-
-*  Parameters:
-*     this
-*        Pointer to the Object.
-*     mode
-*        An integer flag indicating what the function should do:
-*
-*        AST__LOCK: Lock the Object for exclusive use by the calling
-*        thread. The "extra" value indicates what should be done if the
-*        Object is already locked (wait or report an error - see astLock).
-*
-*        AST__UNLOCK: Unlock the Object for use by other threads.
-*
-*        AST__CHECKLOCK: Check that the object is locked for use by the
-*        calling thread (report an error if not).
-*     extra
-*        Extra mode-specific information.
-*     fail
-*        If a non-zero function value is returned, a pointer to the
-*        Object that caused the failure is returned at "*fail". This may
-*        be "this" or it may be an Object contained within "this". Note,
-*        the Object's reference count is not incremented, and so the
-*        returned pointer should not be annulled. A NULL pointer is
-*        returned if this function returns a value of zero.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*    A local status value:
-*        0 - Success
-*        1 - Could not lock or unlock the object because it was already
-*            locked by another thread.
-*        2 - Failed to lock a POSIX mutex
-*        3 - Failed to unlock a POSIX mutex
-*        4 - Bad "mode" value supplied.
-
-*  Notes:
-*     - This function attempts to execute even if an error has already
-*     occurred.
-*/
-
-/* Local Variables: */
-   AstTranMap *this;       /* Pointer to TranMap structure */
-   int result;             /* Returned status value */
-
-/* Initialise */
-   result = 0;
-
-/* Check the supplied pointer is not NULL. */
-   if( !this_object ) return result;
-
-/* Obtain a pointers to the TranMap structure. */
-   this = (AstTranMap *) this_object;
-
-/* Invoke the ManageLock method inherited from the parent class. */
-   if( !result ) result = (*parent_managelock)( this_object, mode, extra,
-                                                fail, status );
-
-/* Invoke the astManageLock method on any Objects contained within
-   the supplied Object. */
-   if( !result ) result = astManageLock( this->map1, mode, extra, fail );
-   if( !result ) result = astManageLock( this->map2, mode, extra, fail );
-
-   return result;
-
-}
-#endif
-
-static int MapMerge( AstMapping *this, int where, int series, int *nmap,
-                     AstMapping ***map_list, int **invert_list, int *status ) {
-/*
-*  Name:
-*     MapMerge
-
-*  Purpose:
-*     Simplify a sequence of Mappings containing a TranMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "mapping.h"
-*     int MapMerge( AstMapping *this, int where, int series, int *nmap,
-*                   AstMapping ***map_list, int **invert_list, int *status )
-
-*  Class Membership:
-*     TranMap method (over-rides the protected astMapMerge method
-*     inherited from the Mapping class).
-
-*  Description:
-*     This function attempts to simplify a sequence of Mappings by
-*     merging a nominated TranMap in the sequence with its neighbours,
-*     so as to shorten the sequence if possible.
-*
-*     In many cases, simplification will not be possible and the
-*     function will return -1 to indicate this, without further
-*     action.
-*
-*     In most cases of interest, however, this function will either
-*     attempt to replace the nominated TranMap with one which it
-*     considers simpler, or to merge it with the Mappings which
-*     immediately precede it or follow it in the sequence (both will
-*     normally be considered). This is sufficient to ensure the
-*     eventual simplification of most Mapping sequences by repeated
-*     application of this function.
-*
-*     In some cases, the function may attempt more elaborate
-*     simplification, involving any number of other Mappings in the
-*     sequence. It is not restricted in the type or scope of
-*     simplification it may perform, but will normally only attempt
-*     elaborate simplification in cases where a more straightforward
-*     approach is not adequate.
-
-*  Parameters:
-*     this
-*        Pointer to the nominated TranMap which is to be merged with
-*        its neighbours. This should be a cloned copy of the TranMap
-*        pointer contained in the array element "(*map_list)[where]"
-*        (see below). This pointer will not be annulled, and the
-*        TranMap it identifies will not be modified by this function.
-*     where
-*        Index in the "*map_list" array (below) at which the pointer
-*        to the nominated TranMap resides.
-*     series
-*        A non-zero value indicates that the sequence of Mappings to
-*        be simplified will be applied in series (i.e. one after the
-*        other), whereas a zero value indicates that they will be
-*        applied in parallel (i.e. on successive sub-sets of the
-*        input/output coordinates).
-*     nmap
-*        Address of an int which counts the number of Mappings in the
-*        sequence. On entry this should be set to the initial number
-*        of Mappings. On exit it will be updated to record the number
-*        of Mappings remaining after simplification.
-*     map_list
-*        Address of a pointer to a dynamically allocated array of
-*        Mapping pointers (produced, for example, by the astMapList
-*        method) which identifies the sequence of Mappings. On entry,
-*        the initial sequence of Mappings to be simplified should be
-*        supplied.
-*
-*        On exit, the contents of this array will be modified to
-*        reflect any simplification carried out. Any form of
-*        simplification may be performed. This may involve any of: (a)
-*        removing Mappings by annulling any of the pointers supplied,
-*        (b) replacing them with pointers to new Mappings, (c)
-*        inserting additional Mappings and (d) changing their order.
-*
-*        The intention is to reduce the number of Mappings in the
-*        sequence, if possible, and any reduction will be reflected in
-*        the value of "*nmap" returned. However, simplifications which
-*        do not reduce the length of the sequence (but improve its
-*        execution time, for example) may also be performed, and the
-*        sequence might conceivably increase in length (but normally
-*        only in order to split up a Mapping into pieces that can be
-*        more easily merged with their neighbours on subsequent
-*        invocations of this function).
-*
-*        If Mappings are removed from the sequence, any gaps that
-*        remain will be closed up, by moving subsequent Mapping
-*        pointers along in the array, so that vacated elements occur
-*        at the end. If the sequence increases in length, the array
-*        will be extended (and its pointer updated) if necessary to
-*        accommodate any new elements.
-*
-*        Note that any (or all) of the Mapping pointers supplied in
-*        this array may be annulled by this function, but the Mappings
-*        to which they refer are not modified in any way (although
-*        they may, of course, be deleted if the annulled pointer is
-*        the final one).
-*     invert_list
-*        Address of a pointer to a dynamically allocated array which,
-*        on entry, should contain values to be assigned to the Invert
-*        attributes of the Mappings identified in the "*map_list"
-*        array before they are applied (this array might have been
-*        produced, for example, by the astMapList method). These
-*        values will be used by this function instead of the actual
-*        Invert attributes of the Mappings supplied, which are
-*        ignored.
-*
-*        On exit, the contents of this array will be updated to
-*        correspond with the possibly modified contents of the
-*        "*map_list" array.  If the Mapping sequence increases in
-*        length, the "*invert_list" array will be extended (and its
-*        pointer updated) if necessary to accommodate any new
-*        elements.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     If simplification was possible, the function returns the index
-*     in the "map_list" array of the first element which was
-*     modified. Otherwise, it returns -1 (and makes no changes to the
-*     arrays supplied).
-
-*  Notes:
-*     - A value of -1 will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*/
-
-/* Local Variables: */
-   AstCmpMap *cmap;              /* Pointer to compound Mapping */
-   AstMapping *cmap_f;           /* Pointer to compound Mapping */
-   AstMapping *cmap_i;           /* Pointer to compound Mapping */
-   AstMapping *hmap1;            /* Pointer to 1st comp of higher TranMap */
-   AstMapping *hmap2;            /* Pointer to 2nd comp of higher TranMap */
-   AstMapping *hmap_f;           /* Pointer to fwd Mapping of higher TranMap */
-   AstMapping *hmap_i;           /* Pointer to inv Mapping of higher TranMap */
-   AstMapping *map1;             /* Pointer to 1st comp of nominated TranMap */
-   AstMapping *map2;             /* Pointer to 2nd comp of nominated TranMap */
-   AstMapping *map_f;            /* Pointer to fwd Mapping of nominated TranMap */
-   AstMapping *map_i;            /* Pointer to inv Mapping of nominated TranMap */
-   AstMapping *smap;             /* Pointer to simplified Mapping */
-   AstMapping *smap_f;           /* Pointer to simplified Mapping */
-   AstMapping *smap_i;           /* Pointer to simplified Mapping */
-   AstTranMap *hmap;             /* Pointer to higher TranMap */
-   AstTranMap *map;              /* Pointer to this TranMap */
-   AstTranMap *new;              /* Pointer to merged TranMap */
-   int i;                        /* Loop count */
-   int old_hinv1;                /* Original Invert flag for hmap->map1 */
-   int old_hinv2;                /* Original Invert flag for hmap->map2 */
-   int old_inv1;                 /* Original Invert flag for this->map1 */
-   int old_inv2;                 /* Original Invert flag for this->map2 */
-   int result;                   /* The value to return */
-
-/* Initialise.*/
-   result = -1;
-
-/* Check the inherited status. */
-   if ( !astOK ) return result;
-
-/* Get a pointer to this TranMap. */
-   map = (AstTranMap *) this;
-
-/* Get the two component Mappings,and temporarily set their Invert
-   attributes back to the values they had when the TranMap was created,
-   saving their current Invert values so that they can be re-instated later. */
-   map1 = map->map1;
-   old_inv1 = astGetInvert( map1 );
-   astSetInvert( map1, map->invert1 );
-
-   map2 = map->map2;
-   old_inv2 = astGetInvert( map2 );
-   astSetInvert( map2, map->invert2 );
-
-/* Simplify the TranMap on its own. */
-/* ================================ */
-
-/* If the TranMap is inverted, creat an equal TranMap which is not inverted.
-   To do this, invert and swap the component Mappings. */
-   if( ( *invert_list )[ where ] ) {
-      astInvert( map1 );
-      astInvert( map2 );
-      new = astTranMap( map2, map1, "", status );
-      astInvert( map1 );
-      astInvert( map2 );
-
-      (void) astAnnul( ( *map_list )[ where ] );
-      ( *map_list )[ where ] = (AstMapping *) new;
-      ( *invert_list )[ where ] = 0;
-      result = where;
-
-/* Otherwise, try to simplify each of the component Mappings. */
-   } else {
-      smap_f = astSimplify( map1 );
-      smap_i = astSimplify( map2 );
-
-/* Assume some simplification took place if the pointers have changed. */
-      if( smap_f != map1 || smap_i != map2 ) {
-
-/* Construct a new TranMap from these simplifgied Mappings. */
-         (void) astAnnul( ( *map_list )[ where ] );
-         ( *map_list )[ where ] = (AstMapping *) astTranMap( smap_f, smap_i, "", status );
-         result = where;
-
-/* Otherwise, if the both component Mappings are defined in both directions... */
-      } else if( astGetTranForward( map1 ) && astGetTranInverse( map1 ) &&
-                 astGetTranForward( map2 ) && astGetTranInverse( map2 ) ) {
-
-/* Form a series CmpMap from the two component Mappings, with the second
-   Mapping inverted. */
-         astInvert( map2 );
-         cmap = astCmpMap( map1, map2, 1, "", status );
-         astInvert( map2 );
-
-/* If this CmpMap simplifies to a UnitMap, then the two components of the
-   TranMap are equal, and so we can replace the entire TranMap with either
-   of its components. Note, we leave the supplied invert flag unchanged,
-   since the copycreated below refers to the Mapping as it was when the
-   TranMap was created. However, we invert the returned Mapping if
-   necessary. */
-         smap = astSimplify( cmap );
-         if( astIsAUnitMap( smap ) ) {
-            (void) astAnnul( ( *map_list )[ where ] );
-            ( *map_list )[ where ] = astCopy( map1 );
-            if( ( *invert_list )[ where ] ) astInvert( ( *map_list )[ where ] );
-            result = where;
-         }
-
-/* Release resources. */
-         smap = astAnnul( smap );
-         cmap = astAnnul( cmap );
-      }
-
-/* Release resources. */
-      smap_f = astAnnul( smap_f );
-      smap_i = astAnnul( smap_i );
-   }
-
-/* Merge the TranMap with a neighbouring TranMap. */
-/* ============================================== */
-/* Only do this if no change was made above, and we are combining the
-   Mappings in series. */
-   if( result == -1 && series ) {
-
-/* Is the higher neighbour a TranMap? */
-      if( where < ( *nmap - 1 ) &&
-          astIsATranMap( ( *map_list )[ where + 1 ] ) ){
-
-/* Get the two component Mappings of the higher TranMap, and temporarily set
-   their Invert attributes back to the values they had when the TranMap was
-   created, saving their current Invert values so that they can be re-instated
-   later. */
-         hmap = (AstTranMap *) ( *map_list )[ where + 1 ];
-
-         hmap1 = hmap->map1;
-         old_hinv1 = astGetInvert( hmap1 );
-         astSetInvert( hmap1, hmap->invert1 );
-
-         hmap2 = hmap->map2;
-         old_hinv2 = astGetInvert( hmap2 );
-         astSetInvert( hmap2, hmap->invert2 );
-
-/* Get the Mappings which defines the forward and inverse transformation of
-   the lower TranMap ("this"). Then, map_f and map_i are pointers to
-   Mappings which could be used to construct a new TranMap which would be
-   equivalent to "this" with the supplied invert setting. */
-         if( ( *invert_list )[ where ] ) {
-            map_f = map2;
-            map_i = map1;
-            astInvert( map_f );
-            astInvert( map_i );
-         } else {
-            map_f = map1;
-            map_i = map2;
-         }
-
-/* Likewise, get the Mappings which defines the forward and inverse
-   transformation of the higher TranMap. */
-         if( ( *invert_list )[ where + 1 ] ) {
-            hmap_f = hmap2;
-            hmap_i = hmap1;
-            astInvert( hmap_f );
-            astInvert( hmap_i );
-         } else {
-            hmap_f = hmap1;
-            hmap_i = hmap2;
-         }
-
-/* Combine the two forward Mappings together into a series CmpMap, and
-   simplify it. */
-         cmap_f = (AstMapping *) astCmpMap( map_f,  hmap_f, 1, "", status );
-         smap_f = astSimplify( cmap_f );
-
-/* Do the same for the inverse Mappings */
-         cmap_i = (AstMapping *) astCmpMap( map_i,  hmap_i, 1, "", status );
-         smap_i = astSimplify( cmap_i );
-
-/* Was any simplification performed? We assume this is the case if the
-   either of the simplied pointer differs from the original pointer. */
-         if( cmap_f != smap_f || cmap_i != smap_i ) {
-
-/* In which case,construct a new TranMap from the simplified Mappings. */
-            new = astTranMap( smap_f, smap_i, "", status );
-
-         } else {
-            new = NULL;
-         }
-
-/* Free resources.*/
-         cmap_f = astAnnul( cmap_f );
-         smap_f = astAnnul( smap_f );
-         cmap_i = astAnnul( cmap_i );
-         smap_i = astAnnul( smap_i );
-
-/* Re-instate the original Invert values for the component Mappings of
-   the higher TranMap. */
-         astSetInvert( hmap1, old_hinv1 );
-         astSetInvert( hmap2, old_hinv2 );
-
-/* If we have a new TranMap, annul the first of the two Mappings, and replace
-   it with the merged TranMap. Also set the invert flag. */
-         if( new ) {
-            (void) astAnnul( ( *map_list )[ where ] );
-            ( *map_list )[ where ] = (AstMapping *) new;
-            ( *invert_list )[ where ] = 0;
-
-/* Annul the second of the two Mappings, and shuffle down the rest of the
-   list to fill the gap. */
-            (void) astAnnul( ( *map_list )[ where + 1 ] );
-            for ( i = where + 2; i < *nmap; i++ ) {
-               ( *map_list )[ i - 1 ] = ( *map_list )[ i ];
-               ( *invert_list )[ i - 1 ] = ( *invert_list )[ i ];
-            }
-
-/* Clear the vacated element at the end. */
-            ( *map_list )[ *nmap - 1 ] = NULL;
-            ( *invert_list )[ *nmap - 1 ] = 0;
-
-/* Decrement the Mapping count and return the index of the first
-   modified element. */
-            ( *nmap )--;
-            result = where;
-         }
-      }
-   }
-
-/* Re-instate the original Invert values for the component Mappings. */
-   astSetInvert( map1, old_inv1 );
-   astSetInvert( map2, old_inv2 );
-
-/* If an error occurred, clear the result value. */
-   if ( !astOK ) result = -1;
-
-/* Return the result. */
-   return result;
-}
-
-static int *MapSplit( AstMapping *this_map, int nin, const int *in, AstMapping **map, int *status ){
-/*
-*  Name:
-*     MapSplit
-
-*  Purpose:
-*     Create a Mapping representing a subset of the inputs of an existing
-*     TranMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     int *MapSplit( AstMapping *this, int nin, const int *in, AstMapping **map, int *status )
-
-*  Class Membership:
-*     TranMap method (over-rides the protected astMapSplit method
-*     inherited from the Mapping class).
-
-*  Description:
-*     This function creates a new Mapping by picking specified inputs from
-*     an existing TranMap. This is only possible if the specified inputs
-*     correspond to some subset of the TranMap outputs. That is, there
-*     must exist a subset of the TranMap outputs for which each output
-*     depends only on the selected TranMap inputs, and not on any of the
-*     inputs which have not been selected. If this condition is not met
-*     by the supplied TranMap, then a NULL Mapping is returned.
-
-*  Parameters:
-*     this
-*        Pointer to the TranMap to be split (the TranMap is not actually
-*        modified by this function).
-*     nin
-*        The number of inputs to pick from "this".
-*     in
-*        Pointer to an array of indices (zero based) for the inputs which
-*        are to be picked. This array should have "nin" elements. If "Nin"
-*        is the number of inputs of the supplied TranMap, then each element
-*        should have a value in the range zero to Nin-1.
-*     map
-*        Address of a location at which to return a pointer to the new
-*        Mapping. This Mapping will have "nin" inputs (the number of
-*        outputs may be different to "nin"). A NULL pointer will be
-*        returned if the supplied TranMap has no subset of outputs which
-*        depend only on the selected inputs.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     A pointer to a dynamically allocated array of ints. The number of
-*     elements in this array will equal the number of outputs for the
-*     returned Mapping. Each element will hold the index of the
-*     corresponding output in the supplied TranMap. The array should be
-*     freed using astFree when no longer needed. A NULL pointer will
-*     be returned if no output Mapping can be created.
-
-*  Notes:
-*     - If this function is invoked with the global error status set,
-*     or if it should fail for any reason, then NULL values will be
-*     returned as the function value and for the "map" pointer.
-*/
-
-/* Local Variables: */
-   AstMapping *fmap;          /* Pointer to forward Mapping in supplied TranMap */
-   AstMapping *imap;          /* Pointer to inverse Mapping in supplied TranMap */
-   AstMapping *rfmap;         /* Pointer to split forward Mapping */
-   AstMapping *rimap;         /* Pointer to split inverse Mapping */
-   AstTranMap *this;          /* Pointer to TranMap structure */
-   int *ires;                 /* I/ps of inv Mapping dependent on selected o/ps */
-   int *out;                  /* O/ps of fwd Mapping dependent on selected i/ps */
-   int *result;               /* Pointer to returned array */
-   int finv;                  /* Invert flag to use with fmap */
-   int i;                     /* Loop count */
-   int iinv;                  /* Invert flag to use with imap */
-   int nout;                  /* No. of outputs dependent on selected inputs */
-   int ok;                    /* Can required Mapping be created? */
-   int old_finv;              /* Original Invert flag for fmap */
-   int old_iinv;              /* Original Invert flag for imap */
-
-/* Initialise */
-   result = NULL;
-   *map = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Invoke the parent astMapSplit method to see if it can do the job. */
-   result = (*parent_mapsplit)( this_map, nin, in, map, status );
-
-/* If not, we provide a special implementation here. */
-   if( !result ) {
-
-/* Get a pointer to the TranMap structure. */
-      this = (AstTranMap *) this_map;
-
-/* Get pointers to the forward and inverse Mappings, taking into account
-   whether the TranMap has been inverted. */
-      if( !astGetInvert( this ) ) {
-         fmap = this->map1;
-         finv = this->invert1;
-         imap = this->map2;
-         iinv = this->invert2;
-      } else {
-         imap = this->map1;
-         iinv = !( this->invert1 );
-         fmap = this->map2;
-         finv = !( this->invert2 );
-      }
-
-/* Temporarily set the Invert flag of both Mappings back to their
-   original values. */
-      old_finv = astGetInvert( fmap );
-      astSetInvert( fmap, finv );
-      old_iinv = astGetInvert( imap );
-      astSetInvert( imap, iinv );
-
-/* Try to split the forward Mapping. */
-      out = astMapSplit( fmap, nin, in, &rfmap );
-
-/* Check the split could be done. */
-      if( out ) {
-
-/* Get the number of outputs which are fed by the selected inputs. */
-         nout = astGetNout( rfmap );
-
-/* See if the inverse Mapping can be split using these outputs as inputs. */
-         astInvert( imap );
-         ires = astMapSplit( imap, nout, out, &rimap );
-         astInvert( imap );
-         if( ires ) {
-            astInvert( rimap );
-
-/* Check that the resulting inputs are the same as the supplied inputs. */
-            if( astGetNin( rimap ) == nin ) {
-               ok = 1;
-               for( i = 0; i < nin; i++ ) {
-                  if( in[ i ] != ires[ i ] ) {
-                     ok = 0;
-                     break;
-                  }
-               }
-
-/* If so create the required new TranMap. */
-               if( ok ) {
-                  *map = (AstMapping *) astTranMap( rfmap, rimap, "", status );
-                  result = out;
-               }
-            }
-
-/* Free resources. */
-            ires = astFree( ires );
-            rimap = astAnnul( rimap );
-         }
-
-         if( !result ) out = astFree( out );
-         rfmap = astAnnul( rfmap );
-      }
-
-/* Re-instate the Invert flags of the component Mappings. */
-      astSetInvert( fmap, old_finv );
-      astSetInvert( imap, old_iinv );
-   }
-
-/* Free returned resources if an error has occurred. */
-   if( !astOK ) {
-      result = astFree( result );
-      *map = astAnnul( *map );
-   }
-
-/* Return the list of output indices. */
-   return result;
-}
-
-static double Rate( AstMapping *this, double *at, int ax1, int ax2, int *status ){
-/*
-*  Name:
-*     Rate
-
-*  Purpose:
-*     Calculate the rate of change of a Mapping output.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     result = Rate( AstMapping *this, double *at, int ax1, int ax2, int *status )
-
-*  Class Membership:
-*     TranMap member function (overrides the astRate method inherited
-*     from the Mapping class ).
-
-*  Description:
-*     This function returns the rate of change of a specified output of
-*     the supplied Mapping with respect to a specified input, at a
-*     specified input position. Also evaluates the second derivative.
-
-*  Parameters:
-*     this
-*        Pointer to the Mapping to be applied.
-*     at
-*        The address of an array holding the axis values at the position
-*        at which the rate of change is to be evaluated. The number of
-*        elements in this array should equal the number of inputs to the
-*        Mapping.
-*     ax1
-*        The index of the Mapping output for which the rate of change is to
-*        be found (output numbering starts at 0 for the first output).
-*     ax2
-*        The index of the Mapping input which is to be varied in order to
-*        find the rate of change (input numbering starts at 0 for the first
-*        input).
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     The rate of change of Mapping output "ax1" with respect to input
-*     "ax2", evaluated at "at", or AST__BAD if the value cannot be
-*     calculated.
-
-*/
-
-/* Local Variables: */
-   AstTranMap *map;
-   AstMapping *cmap;
-   double result;
-   int cinv;
-   int old_inv;
-
-/* Check inherited status */
-   if( !astOK ) return AST__BAD;
-
-/* Get a pointer to the TranMap structure. */
-   map = (AstTranMap *) this;
-
-/* Choose the component Mapping to use, and get its original Invert
-   value. Invert this if the TranMap itself has been inverted (this is
-   because the astRate function has no "invert" argument so we need to
-   invert the Mapping before calling astRate). */
-   if( astGetInvert( this ) ) {
-      cmap = map->map2;
-      cinv = !(map->invert2);
-   } else {
-      cmap = map->map1;
-      cinv = map->invert1;
-   }
-
-/* Temporarily set the Invert flag of the component Mapping back to its
-   original value. */
-   old_inv = astGetInvert( cmap );
-   astSetInvert( cmap, cinv );
-
-/* Use the astRate method of the component Mapping. */
-   result = astRate( cmap, at, ax1, ax2 );
-
-/* Re-instate the Invert flag of the component Mapping. */
-   astSetInvert( cmap, old_inv );
-
-/* Return the result. */
-   return result;
-}
-
-static AstMapping *RemoveRegions( AstMapping *this_mapping, int *status ) {
-/*
-*  Name:
-*     RemoveRegions
-
-*  Purpose:
-*     Remove any Regions from a Mapping.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     AstMapping *RemoveRegions( AstMapping *this, int *status )
-
-*  Class Membership:
-*     TranMap method (over-rides the astRemoveRegions method inherited
-*     from the Mapping class).
-
-*  Description:
-*     This function searches the supplied Mapping (which may be a
-*     compound Mapping such as a TranMap) for any component Mappings
-*     that are instances of the AST Region class. It then creates a new
-*     Mapping from which all Regions have been removed. If a Region
-*     cannot simply be removed (for instance, if it is a component of a
-*     parallel TranMap), then it is replaced with an equivalent UnitMap
-*     in the returned Mapping.
-*
-*     The implementation provided by the TranMap class invokes the
-*     astRemoveRegions method on the two component Mappings, and joins
-*     the results together into a new TranMap.
-
-*  Parameters:
-*     this
-*        Pointer to the original Region.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     A pointer to the modified mapping.
-
-*  Notes:
-*     - A NULL pointer value will be returned if this function is
-*     invoked with the AST error status set, or if it should fail for
-*     any reason.
-*/
-
-/* Local Variables: */
-   AstTranMap *new;              /* Pointer to new TranMap */
-   AstTranMap *this;             /* Pointer to TranMap structure */
-   AstMapping *newmap1;          /* New first component Mapping */
-   AstMapping *newmap2;          /* New second component Mapping */
-   AstMapping *result;           /* Result pointer to return */
-   int nax;                      /* Number of Frame axes */
-   int unit1;                    /* Is new first Mapping a UnitMap? */
-   int unit2;                    /* Is new second Mapping a UnitMap? */
-
-/* Initialise. */
-   result = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Get a pointer to the TranMap. */
-   this = (AstTranMap *) this_mapping;
-
-/* Invoke the astRemoveRegions method on the two component Mappings. */
-   newmap1 = astRemoveRegions( this->map1 );
-   newmap2 = astRemoveRegions( this->map2 );
-
-/* If neither component was modified, just return a clone of the supplied
-   pointer. */
-   if( this->map1 == newmap1 && this->map2 == newmap2 ) {
-      result = astClone( this );
-
-/* Otherwise, we need to create a new Mapping to return. */
-   } else {
-
-/* The implementation of the astRemoveRegions method provided by the
-   Region class returns a Frame rather than a UnitMap. But we need
-   Mappings here, not Frames. So if either of these new Mappings is
-   a Frame, replace it with an equivalent UnitMap. Also, get flags
-   indicating if either Mapping is a UnitMap.*/
-      if( astIsAFrame( newmap1 ) ) {
-         nax = astGetNin( newmap1 );
-         (void) astAnnul( newmap1 );
-         newmap1 = (AstMapping *) astUnitMap( nax, " ", status );
-         unit1 = 1;
-      } else {
-         unit1 = astIsAUnitMap( newmap1 );
-      }
-
-      if( astIsAFrame( newmap2 ) ) {
-         nax = astGetNin( newmap2 );
-         (void) astAnnul( newmap2 );
-         newmap2 = (AstMapping *) astUnitMap( nax, " ", status );
-         unit2 = 1;
-      } else {
-         unit2 = astIsAUnitMap( newmap2 );
-      }
-
-/* If both new Mappings are UnitMaps, return an equivalent UnitMap. */
-      if( unit1 && unit2 ) {
-         result = (AstMapping *) astUnitMap( astGetNin( newmap1 ) +
-                                             astGetNin( newmap2 ), " ",
-                                             status );
-
-/* Otherwise, return a new TranMap containing the two new Mappings. */
-      } else {
-         new = astCopy( this );
-         (void) astAnnul( new->map1 );
-         (void) astAnnul( new->map2 );
-         new->map1 = astClone( newmap1 );
-         new->map2 = astClone( newmap2 );
-         result = (AstMapping *) new;
-      }
-   }
-
-/* Free resources. */
-   newmap1 = astAnnul( newmap1 );
-   newmap2 = astAnnul( newmap2 );
-
-/* Annul the returned Mapping if an error has occurred. */
-   if( !astOK ) result = astAnnul( result );
-
-/* Return the result. */
-   return result;
-}
-
-static AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-                               int forward, AstPointSet *out, int *status ) {
-/*
-*  Name:
-*     Transform
-
-*  Purpose:
-*     Apply a TranMap to transform a set of points.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-*                             int forward, AstPointSet *out, int *status )
-
-*  Class Membership:
-*     TranMap member function (over-rides the astTransform method inherited
-*     from the Mapping class).
-
-*  Description:
-*     This function takes a TranMap and a set of points encapsulated in a
-*     PointSet and transforms the points so as to apply the required Mapping.
-*     This implies applying each of the TranMap's component Mappings in turn,
-*     either in series or in parallel.
-
-*  Parameters:
-*     this
-*        Pointer to the TranMap.
-*     in
-*        Pointer to the PointSet associated with the input coordinate values.
-*     forward
-*        A non-zero value indicates that the forward coordinate transformation
-*        should be applied, while a zero value requests the inverse
-*        transformation.
-*     out
-*        Pointer to a PointSet which will hold the transformed (output)
-*        coordinate values. A NULL value may also be given, in which case a
-*        new PointSet will be created by this function.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     Pointer to the output (possibly new) PointSet.
-
-*  Notes:
-*     -  A null pointer will be returned if this function is invoked with the
-*     global error status set, or if it should fail for any reason.
-*     -  The number of coordinate values per point in the input PointSet must
-*     match the number of coordinates for the TranMap being applied.
-*     -  If an output PointSet is supplied, it must have space for sufficient
-*     number of points and coordinate values per point to accommodate the
-*     result. Any excess space will be ignored.
-*/
-
-/* Local Variables: */
-   AstMapping *cmap;             /* Mapping which defines the required transformation */
-   AstPointSet *result;          /* Pointer to output PointSet */
-   AstTranMap *map;              /* Pointer to TranMap to be applied */
-   int cinv;                     /* Invert flag when TranMap was created */
-   int old_inv;                  /* Invert flag on entry to this function */
-
-/* Check the global error status. */
-   if ( !astOK ) return NULL;
-
-/* Obtain a pointer to the TranMap. */
-   map = (AstTranMap *) this;
-
-/* Apply the parent Mapping using the stored pointer to the Transform member
-   function inherited from the parent Mapping class. This function validates
-   all arguments and generates an output PointSet if necessary, but does not
-   actually transform any coordinate values. */
-   result = (*parent_transform)( this, in, forward, out, status );
-
-/* We now extend the parent astTransform method by applying the component
-   Mappings of the TranMap to generate the output coordinate values. */
-
-/* Determine whether to apply the forward or inverse Mapping, according to the
-   direction specified and whether the Mapping has been inverted. */
-   if ( astGetInvert( map ) ) forward = !forward;
-
-/* Choose the component Mapping to use, and get its original Invert value. */
-   if( forward ) {
-      cmap = map->map1;
-      cinv = map->invert1;
-   }else {
-      cmap = map->map2;
-      cinv = map->invert2;
-   }
-
-/* Temporarily set the Invert flag of the component Mapping back to its
-   original value. */
-   old_inv = astGetInvert( cmap );
-   astSetInvert( cmap, cinv );
-
-/* Use the Transform method of the component Mapping. */
-   result = astTransform( cmap, in, forward, out );
-
-/* Re-instate the Invert flag of the component Mapping. */
-   astSetInvert( cmap, old_inv );
-
-/* If an error occurred, clean up by deleting the output PointSet (if
-   allocated by this function) and setting a NULL result pointer. */
-   if ( !astOK ) {
-      if ( !out ) result = astDelete( result );
-      result = NULL;
-   }
-
-/* Return a pointer to the output PointSet. */
-   return result;
-}
-
-/* Copy constructor. */
-/* ----------------- */
-static void Copy( const AstObject *objin, AstObject *objout, int *status ) {
-/*
-*  Name:
-*     Copy
-
-*  Purpose:
-*     Copy constructor for TranMap objects.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     void Copy( const AstObject *objin, AstObject *objout, int *status )
-
-*  Description:
-*     This function implements the copy constructor for TranMap objects.
-
-*  Parameters:
-*     objin
-*        Pointer to the object to be copied.
-*     objout
-*        Pointer to the object being constructed.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     void
-
-*  Notes:
-*     -  This constructor makes a deep copy, including a copy of the component
-*     Mappings within the TranMap.
-*/
-
-/* Local Variables: */
-   AstTranMap *in;                /* Pointer to input TranMap */
-   AstTranMap *out;               /* Pointer to output TranMap */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain pointers to the input and output TranMaps. */
-   in = (AstTranMap *) objin;
-   out = (AstTranMap *) objout;
-
-/* For safety, start by clearing any references to the input component
-   Mappings from the output TranMap. */
-   out->map1 = NULL;
-   out->map2 = NULL;
-
-/* Make copies of these Mappings and store pointers to them in the output
-   TranMap structure. */
-   out->map1 = astCopy( in->map1 );
-   out->map2 = astCopy( in->map2 );
-}
-
-/* Destructor. */
-/* ----------- */
-static void Delete( AstObject *obj, int *status ) {
-/*
-*  Name:
-*     Delete
-
-*  Purpose:
-*     Destructor for TranMap objects.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     void Delete( AstObject *obj, int *status )
-
-*  Description:
-*     This function implements the destructor for TranMap objects.
-
-*  Parameters:
-*     obj
-*        Pointer to the object to be deleted.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     void
-
-*  Notes:
-*     This function attempts to execute even if the global error status is
-*     set.
-*/
-
-/* Local Variables: */
-   AstTranMap *this;              /* Pointer to TranMap */
-
-/* Obtain a pointer to the TranMap structure. */
-   this = (AstTranMap *) obj;
-
-/* Annul the pointers to the component Mappings. */
-   this->map1 = astAnnul( this->map1 );
-   this->map2 = astAnnul( this->map2 );
-
-/* Clear the remaining TranMap variables. */
-   this->invert1 = 0;
-   this->invert2 = 0;
-}
-
-/* Dump function. */
-/* -------------- */
-static void Dump( AstObject *this_object, AstChannel *channel, int *status ) {
-/*
-*  Name:
-*     Dump
-
-*  Purpose:
-*     Dump function for TranMap objects.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     void Dump( AstObject *this, AstChannel *channel, int *status )
-
-*  Description:
-*     This function implements the Dump function which writes out data
-*     for the TranMap class to an output Channel.
-
-*  Parameters:
-*     this
-*        Pointer to the TranMap whose data are being written.
-*     channel
-*        Pointer to the Channel to which the data are being written.
-*     status
-*        Pointer to the inherited status variable.
-*/
-
-/* Local Variables: */
-   AstTranMap *this;              /* Pointer to the TranMap structure */
-   int ival;                     /* Integer value */
-   int set;                      /* Attribute value set? */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the TranMap structure. */
-   this = (AstTranMap *) this_object;
-
-/* Write out values representing the instance variables for the TranMap
-   class.  Accompany these with appropriate comment strings, possibly
-   depending on the values being written.*/
-
-/* In the case of attributes, we first use the appropriate (private)
-   Test...  member function to see if they are set. If so, we then use
-   the (private) Get... function to obtain the value to be written
-   out.
-
-   For attributes which are not set, we use the astGet... method to
-   obtain the value instead. This will supply a default value
-   (possibly provided by a derived class which over-rides this method)
-   which is more useful to a human reader as it corresponds to the
-   actual default attribute value.  Since "set" will be zero, these
-   values are for information only and will not be read back. */
-
-/* First Invert flag. */
-/* ------------------ */
-   ival = this->invert1;
-   set = ( ival != 0 );
-   astWriteInt( channel, "InvA", set, 0, ival,
-                ival ? "First Mapping used in inverse direction" :
-                       "First Mapping used in forward direction" );
-
-/* Second Invert flag. */
-/* ------------------- */
-   ival = this->invert2;
-   set = ( ival != 0 );
-   astWriteInt( channel, "InvB", set, 0, ival,
-                ival ? "Second Mapping used in inverse direction" :
-                       "Second Mapping used in forward direction" );
-
-/* First Mapping. */
-/* -------------- */
-   astWriteObject( channel, "MapA", 1, 1, this->map1,
-                   "Mapping for forward transformation" );
-
-/* Second Mapping. */
-/* --------------- */
-   astWriteObject( channel, "MapB", 1, 1, this->map2,
-                   "Mapping for inverse transformation" );
-}
-
-/* Standard class functions. */
-/* ========================= */
-/* Implement the astIsATranMap and astCheckTranMap functions using the
-   macros defined for this purpose in the "object.h" header file. */
-astMAKE_ISA(TranMap,Mapping)
-astMAKE_CHECK(TranMap)
-
-AstTranMap *astTranMap_( void *map1_void, void *map2_void, const char *options, int *status, ...) {
-/*
-*+
-*  Name:
-*     astTranMap
-
-*  Purpose:
-*     Create a TranMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     AstTranMap *astTranMap( AstMapping *map1, AstMapping *map2, const char *options, int *status, ... )
-
-*  Class Membership:
-*     TranMap constructor.
-
-*  Description:
-*     This function creates a new TranMap and optionally initialises its
-*     attributes.
-
-*  Parameters:
-*     map1
-*        Pointer to the first Mapping (which deinfes the forward
-*        transformation).
-*     map2
-*        Pointer to the second Mapping (which deinfes the inverse
-*        transformation).
-*     options
-*        Pointer to a null terminated string containing an optional
-*        comma-separated list of attribute assignments to be used for
-*        initialising the new TranMap. The syntax used is the same as for the
-*        astSet method and may include "printf" format specifiers identified
-*        by "%" symbols in the normal way.
-*     status
-*        Pointer to the inherited status variable.
-*     ...
-*        If the "options" string contains "%" format specifiers, then an
-*        optional list of arguments may follow it in order to supply values to
-*        be substituted for these specifiers. The rules for supplying these
-*        are identical to those for the astSet method (and for the C "printf"
-*        function).
-
-*  Returned Value:
-*     A pointer to the new TranMap.
-
-*  Notes:
-*     - A null pointer will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*-
-
-*  Implementation Notes:
-*     - This function implements the basic TranMap constructor which is
-*     available via the protected interface to the TranMap class.  A
-*     public interface is provided by the astTranMapId_ function.
-*     - Because this function has a variable argument list, it is
-*     invoked by a macro that evaluates to a function pointer (not a
-*     function invocation) and no checking or casting of arguments is
-*     performed before the function is invoked. Because of this, the
-*     "map1" and "map2" parameters are of type (void *) and are
-*     converted and validated within the function itself.
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstTranMap *new;              /* Pointer to new TranMap */
-   AstMapping *map1;             /* Pointer to first Mapping structure */
-   AstMapping *map2;             /* Pointer to second Mapping structure */
-   va_list args;                 /* Variable argument list */
-
-/* Initialise. */
-   new = NULL;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Check the global status. */
-   if ( !astOK ) return new;
-
-/* Obtain and validate pointers to the Mapping structures provided. */
-   map1 = astCheckMapping( map1_void );
-   map2 = astCheckMapping( map2_void );
-   if ( astOK ) {
-
-/* Initialise the TranMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-      new = astInitTranMap( NULL, sizeof( AstTranMap ), !class_init, &class_vtab,
-                           "TranMap", map1, map2 );
-
-/* If successful, note that the virtual function table has been
-   initialised. */
-      if ( astOK ) {
-         class_init = 1;
-
-/* Obtain the variable argument list and pass it along with the
-   options string to the astVSet method to initialise the new TranMap's
-   attributes. */
-         va_start( args, status );
-         astVSet( new, options, NULL, args );
-         va_end( args );
-
-/* If an error occurred, clean up by deleting the new object. */
-         if ( !astOK ) new = astDelete( new );
-      }
-   }
-
-/* Return a pointer to the new TranMap. */
-   return new;
-}
-
-AstTranMap *astTranMapId_( void *map1_void, void *map2_void,
-                           const char *options, ... ) {
-/*
-*++
-*  Name:
-c     astTranMap
-f     AST_TRANMAP
-
-*  Purpose:
-*     Create a TranMap.
-
-*  Type:
-*     Public function.
-
-*  Synopsis:
-c     #include "tranmap.h"
-c     AstTranMap *astTranMap( AstMapping *map1, AstMapping *map2,
-c                           const char *options, ... )
-f     RESULT = AST_TRANMAP( MAP1, MAP2, OPTIONS, STATUS )
-
-*  Class Membership:
-*     TranMap constructor.
-
-*  Description:
-*     This function creates a new TranMap and optionally initialises
-*     its attributes.
-*
-*     A TranMap is a Mapping which combines the forward transformation of
-*     a supplied Mapping with the inverse transformation of another
-*     supplied Mapping, ignoring the un-used transformation in each
-*     Mapping (indeed the un-used transformation need not exist).
-*
-*     When the forward transformation of the TranMap is referred to, the
-*     transformation actually used is the forward transformation of the
-*     first Mapping supplied when the TranMap was constructed. Likewise,
-*     when the inverse transformation of the TranMap is referred to, the
-*     transformation actually used is the inverse transformation of the
-*     second Mapping supplied when the TranMap was constructed.
-
-*  Parameters:
-c     map1
-f     MAP1 = INTEGER (Given)
-*        Pointer to the first component Mapping, which defines the
-*        forward transformation.
-c     map2
-f     MAP2 = INTEGER (Given)
-*        Pointer to the second component Mapping, which defines the
-*        inverse transformation.
-c     options
-f     OPTIONS = CHARACTER * ( * ) (Given)
-c        Pointer to a null-terminated string containing an optional
-c        comma-separated list of attribute assignments to be used for
-c        initialising the new TranMap. The syntax used is identical to
-c        that for the astSet function and may include "printf" format
-c        specifiers identified by "%" symbols in the normal way.
-f        A character string containing an optional comma-separated
-f        list of attribute assignments to be used for initialising the
-f        new TranMap. The syntax used is identical to that for the
-f        AST_SET routine.
-c     ...
-c        If the "options" string contains "%" format specifiers, then
-c        an optional list of additional arguments may follow it in
-c        order to supply values to be substituted for these
-c        specifiers. The rules for supplying these are identical to
-c        those for the astSet function (and for the C "printf"
-c        function).
-f     STATUS = INTEGER (Given and Returned)
-f        The global status.
-
-*  Returned Value:
-c     astTranMap()
-f     AST_TRANMAP = INTEGER
-*        A pointer to the new TranMap.
-
-*  Notes:
-*     - The number of output coordinates generated by the two Mappings
-*     (their Nout attribute) must be equal, as must the number of input
-*     coordinates accepted by each Mapping (their Nin attribute).
-*     - The forward transformation of the first Mapping must exist.
-*     - The inverse transformation of the second Mapping must exist.
-c     - Note that the component Mappings supplied are not copied by
-c     astTranMap (the new TranMap simply retains a reference to
-c     them). They may continue to be used for other purposes, but
-c     should not be deleted. If a TranMap containing a copy of its
-c     component Mappings is required, then a copy of the TranMap should
-c     be made using astCopy.
-f     - Note that the component Mappings supplied are not copied by
-f     AST_TRANMAP (the new TranMap simply retains a reference to
-f     them). They may continue to be used for other purposes, but
-f     should not be deleted. If a TranMap containing a copy of its
-f     component Mappings is required, then a copy of the TranMap should
-f     be made using AST_COPY.
-*     - A null Object pointer (AST__NULL) will be returned if this
-c     function is invoked with the AST error status set, or if it
-f     function is invoked with STATUS set to an error value, or if it
-*     should fail for any reason.
-
-*  Status Handling:
-*     The protected interface to this function includes an extra
-*     parameter at the end of the parameter list descirbed above. This
-*     parameter is a pointer to the integer inherited status
-*     variable: "int *status".
-
-*--
-
-*  Implementation Notes:
-*     - This function implements the external (public) interface to
-*     the astTranMap constructor function. It returns an ID value
-*     (instead of a true C pointer) to external users, and must be
-*     provided because astTranMap_ has a variable argument list which
-*     cannot be encapsulated in a macro (where this conversion would
-*     otherwise occur).
-*     - Because no checking or casting of arguments is performed
-*     before the function is invoked, the "map1" and "map2" parameters
-*     are of type (void *) and are converted from an ID value to a
-*     pointer and validated within the function itself.
-*     - The variable argument list also prevents this function from
-*     invoking astTranMap_ directly, so it must be a re-implementation
-*     of it in all respects, except for the conversions between IDs
-*     and pointers on input/output of Objects.
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstTranMap *new;               /* Pointer to new TranMap */
-   AstMapping *map1;             /* Pointer to first Mapping structure */
-   AstMapping *map2;             /* Pointer to second Mapping structure */
-   va_list args;                 /* Variable argument list */
-
-   int *status;                  /* Pointer to inherited status value */
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Initialise. */
-   new = NULL;
-
-/* Get a pointer to the inherited status value. */
-   status = astGetStatusPtr;
-
-/* Check the global status. */
-   if ( !astOK ) return new;
-
-/* Obtain the Mapping pointers from the ID's supplied and validate the
-   pointers to ensure they identify valid Mappings. */
-   map1 = astVerifyMapping( astMakePointer( map1_void ) );
-   map2 = astVerifyMapping( astMakePointer( map2_void ) );
-   if ( astOK ) {
-
-/* Initialise the TranMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-      new = astInitTranMap( NULL, sizeof( AstTranMap ), !class_init, &class_vtab,
-                           "TranMap", map1, map2 );
-
-/* If successful, note that the virtual function table has been initialised. */
-      if ( astOK ) {
-         class_init = 1;
-
-/* Obtain the variable argument list and pass it along with the
-   options string to the astVSet method to initialise the new TranMap's
-   attributes. */
-         va_start( args, options );
-         astVSet( new, options, NULL, args );
-         va_end( args );
-
-/* If an error occurred, clean up by deleting the new object. */
-         if ( !astOK ) new = astDelete( new );
-      }
-   }
-
-/* Return an ID value for the new TranMap. */
-   return astMakeId( new );
-}
-
-AstTranMap *astInitTranMap_( void *mem, size_t size, int init,
-                           AstTranMapVtab *vtab, const char *name,
-                           AstMapping *map1, AstMapping *map2, int *status ) {
-/*
-*+
-*  Name:
-*     astInitTranMap
-
-*  Purpose:
-*     Initialise a TranMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     AstTranMap *astInitTranMap( void *mem, size_t size, int init,
-*                               AstTranMapVtab *vtab, const char *name,
-*                               AstMapping *map1, AstMapping *map2 )
-
-*  Class Membership:
-*     TranMap initialiser.
-
-*  Description:
-*     This function is provided for use by class implementations to initialise
-*     a new TranMap object. It allocates memory (if necessary) to
-*     accommodate the TranMap plus any additional data associated with the
-*     derived class. It then initialises a TranMap structure at the start
-*     of this memory. If the "init" flag is set, it also initialises the
-*     contents of a virtual function table for a TranMap at the start of
-*     the memory passed via the "vtab" parameter.
-
-*  Parameters:
-*     mem
-*        A pointer to the memory in which the TranMap is to be initialised.
-*        This must be of sufficient size to accommodate the TranMap data
-*        (sizeof(TranMap)) plus any data used by the derived class. If a
-*        value of NULL is given, this function will allocate the memory itself
-*        using the "size" parameter to determine its size.
-*     size
-*        The amount of memory used by the TranMap (plus derived class
-*        data). This will be used to allocate memory if a value of NULL is
-*        given for the "mem" parameter. This value is also stored in the
-*        TranMap structure, so a valid value must be supplied even if not
-*        required for allocating memory.
-*     init
-*        A logical flag indicating if the TranMap's virtual function table
-*        is to be initialised. If this value is non-zero, the virtual function
-*        table will be initialised by this function.
-*     vtab
-*        Pointer to the start of the virtual function table to be associated
-*        with the new TranMap.
-*     name
-*        Pointer to a constant null-terminated character string which contains
-*        the name of the class to which the new object belongs (it is this
-*        pointer value that will subsequently be returned by the Object
-*        astClass function).
-*     map1
-*        Pointer to the first Mapping.
-*     map2
-*        Pointer to the second Mapping.
-
-*  Returned Value:
-*     A pointer to the new TranMap.
-
-*  Notes:
-*     -  A null pointer will be returned if this function is invoked with the
-*     global error status set, or if it should fail for any reason.
-*-
-*/
-
-/* Local Variables: */
-   AstTranMap *new;               /* Pointer to new TranMap */
-   int nin;                      /* No. input coordinates for TranMap */
-   int nout;                     /* No. output coordinates for TranMap */
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* If necessary, initialise the virtual function table. */
-   if ( init ) astInitTranMapVtab( vtab, name );
-
-/* Initialise. */
-   new = NULL;
-
-/* Report an error if map1 has no forward transformation. */
-   if( !astGetTranForward( map1 ) && astOK ) {
-      astError( AST__INTRD, "astInitTranMap(%s): The first supplied Mapping "
-              "is not able to transform coordinates in the forward direction.", status,
-              name );
-   }
-
-/* Report an error if map2 has no inverse transformation. */
-   if( !astGetTranInverse( map2 ) && astOK ) {
-      astError( AST__INTRD, "astInitTranMap(%s): The second supplied Mapping "
-              "is not able to transform coordinates in the inverse direction.", status,
-              name );
-   }
-
-/* Check that the number of coordinates are compatible and report an error if
-   they are not. */
-   nout = astGetNout( map1 );
-   if ( astGetNout( map2 ) != nout && astOK ) {
-      astError( AST__INNCO, "astInitTranMap(%s): The number of output "
-                      "coordinates per point (%d) for the first Mapping "
-                      "supplied does not match the number of output "
-                      "coordinates (%d) for the second Mapping.", status, name, nout,
-                      astGetNout( map2 ) );
-   }
-
-   nin = astGetNin( map1 );
-   if ( astGetNin( map2 ) != nin && astOK ) {
-      astError( AST__INNCO, "astInitTranMap(%s): The number of input "
-                      "coordinates per point (%d) for the first Mapping "
-                      "supplied does not match the number of input "
-                      "coordinates (%d) for the second Mapping.", status, name, nin,
-                      astGetNin( map2 ) );
-   }
-
-/* Initialise a Mapping structure (the parent class) as the first component
-   within the TranMap structure, allocating memory if necessary. Specify
-   the number of input and output coordinates and in which directions the
-   Mapping should be defined. */
-   if ( astOK ) {
-      new = (AstTranMap *) astInitMapping( mem, size, 0,
-                                          (AstMappingVtab *) vtab, name,
-                                          nin, nout, 1, 1 );
-
-      if ( astOK ) {
-
-/* Initialise the TranMap data. */
-/* --------------------------- */
-/* Store pointers to the component Mappings. */
-         new->map1 = astClone( map1 );
-         new->map2 = astClone( map2 );
-
-/* Save the initial values of the inversion flags for these Mappings. */
-         new->invert1 = astGetInvert( map1 );
-         new->invert2 = astGetInvert( map2 );
-
-/* If an error occurred, clean up by annulling the Mapping pointers and
-   deleting the new object. */
-         if ( !astOK ) {
-            new->map1 = astAnnul( new->map1 );
-            new->map2 = astAnnul( new->map2 );
-            new = astDelete( new );
-         }
-      }
-   }
-
-/* Return a pointer to the new object. */
-   return new;
-}
-
-AstTranMap *astLoadTranMap_( void *mem, size_t size,
-                           AstTranMapVtab *vtab, const char *name,
-                           AstChannel *channel, int *status ) {
-/*
-*+
-*  Name:
-*     astLoadTranMap
-
-*  Purpose:
-*     Load a TranMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "tranmap.h"
-*     AstTranMap *astLoadTranMap( void *mem, size_t size,
-*                               AstTranMapVtab *vtab, const char *name,
-*                               AstChannel *channel )
-
-*  Class Membership:
-*     TranMap loader.
-
-*  Description:
-*     This function is provided to load a new TranMap using data read
-*     from a Channel. It first loads the data used by the parent class
-*     (which allocates memory if necessary) and then initialises a
-*     TranMap structure in this memory, using data read from the input
-*     Channel.
-*
-*     If the "init" flag is set, it also initialises the contents of a
-*     virtual function table for a TranMap at the start of the memory
-*     passed via the "vtab" parameter.
-
-
-*  Parameters:
-*     mem
-*        A pointer to the memory into which the TranMap is to be
-*        loaded.  This must be of sufficient size to accommodate the
-*        TranMap data (sizeof(TranMap)) plus any data used by derived
-*        classes. If a value of NULL is given, this function will
-*        allocate the memory itself using the "size" parameter to
-*        determine its size.
-*     size
-*        The amount of memory used by the TranMap (plus derived class
-*        data).  This will be used to allocate memory if a value of
-*        NULL is given for the "mem" parameter. This value is also
-*        stored in the TranMap structure, so a valid value must be
-*        supplied even if not required for allocating memory.
-*
-*        If the "vtab" parameter is NULL, the "size" value is ignored
-*        and sizeof(AstTranMap) is used instead.
-*     vtab
-*        Pointer to the start of the virtual function table to be
-*        associated with the new TranMap. If this is NULL, a pointer to
-*        the (static) virtual function table for the TranMap class is
-*        used instead.
-*     name
-*        Pointer to a constant null-terminated character string which
-*        contains the name of the class to which the new object
-*        belongs (it is this pointer value that will subsequently be
-*        returned by the astGetClass method).
-*
-*        If the "vtab" parameter is NULL, the "name" value is ignored
-*        and a pointer to the string "TranMap" is used instead.
-
-*  Returned Value:
-*     A pointer to the new TranMap.
-
-*  Notes:
-*     - A null pointer will be returned if this function is invoked
-*     with the global error status set, or if it should fail for any
-*     reason.
-*-
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstTranMap *new;               /* Pointer to the new TranMap */
-
-/* Initialise. */
-   new = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return new;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(channel);
-
-/* If a NULL virtual function table has been supplied, then this is
-   the first loader to be invoked for this TranMap. In this case the
-   TranMap belongs to this class, so supply appropriate values to be
-   passed to the parent class loader (and its parent, etc.). */
-   if ( !vtab ) {
-      size = sizeof( AstTranMap );
-      vtab = &class_vtab;
-      name = "TranMap";
-
-/* If required, initialise the virtual function table for this class. */
-      if ( !class_init ) {
-         astInitTranMapVtab( vtab, name );
-         class_init = 1;
-      }
-   }
-
-/* Invoke the parent class loader to load data for all the ancestral
-   classes of the current one, returning a pointer to the resulting
-   partly-built TranMap. */
-   new = astLoadMapping( mem, size, (AstMappingVtab *) vtab, name,
-                         channel );
-
-   if ( astOK ) {
-
-/* Read input data. */
-/* ================ */
-/* Request the input Channel to read all the input data appropriate to
-   this class into the internal "values list". */
-      astReadClassData( channel, "TranMap" );
-
-/* Now read each individual data item from this list and use it to
-   initialise the appropriate instance variable(s) for this class. */
-
-/* In the case of attributes, we first read the "raw" input value,
-   supplying the "unset" value as the default. If a "set" value is
-   obtained, we then use the appropriate (private) Set... member
-   function to validate and set the value properly. */
-
-/* First Invert flag. */
-/* ------------------ */
-      new->invert1 = astReadInt( channel, "inva", 0 );
-      new->invert1 = ( new->invert1 != 0 );
-
-/* Second Invert flag. */
-/* ------------------- */
-      new->invert2 = astReadInt( channel, "invb", 0 );
-      new->invert2 = ( new->invert2 != 0 );
-
-/* First Mapping. */
-/* -------------- */
-      new->map1 = astReadObject( channel, "mapa", NULL );
-
-/* Second Mapping. */
-/* --------------- */
-      new->map2 = astReadObject( channel, "mapb", NULL );
-
-/* If an error occurred, clean up by deleting the new TranMap. */
-      if ( !astOK ) new = astDelete( new );
-   }
-
-/* Return the new TranMap pointer. */
-   return new;
-}
-
-/* Virtual function interfaces. */
-/* ============================ */
-/* These provide the external interface to the virtual functions defined by
-   this class. Each simply checks the global error status and then locates and
-   executes the appropriate member function, using the function pointer stored
-   in the object's virtual function table (this pointer is located using the
-   astMEMBER macro defined in "object.h").
-
-   Note that the member function may not be the one defined here, as it may
-   have been over-ridden by a derived class. However, it should still have the
-   same interface. */
-
-/* None. */
-
-
-
-