update ast 8.6.2

1 files changed, 0 insertions, 1617 deletions

diff --git a/ast/shiftmap.c b/ast/shiftmap.c
deleted file mode 100644
index eed6e1d..0000000
--- a/ast/shiftmap.c
+++ /dev/null
@@ -1,1617 +0,0 @@
-/*
-*class++
-*  Name:
-*     ShiftMap
-
-*  Purpose:
-*     Add a constant value to each coordinate.
-
-*  Constructor Function:
-c     astShiftMap
-f     AST_SHIFTMAP
-
-*  Description:
-*     A ShiftMap is a linear Mapping which shifts each axis by a
-*     specified constant value.
-
-*  Inheritance:
-*     The ShiftMap class inherits from the Mapping class.
-
-*  Attributes:
-*     The ShiftMap class does not define any new attributes beyond those
-*     which are applicable to all Mappings.
-
-*  Functions:
-c     The ShiftMap class does not define any new functions beyond those
-f     The ShiftMap 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 Berry (Starlink)
-
-*  History:
-*     15-AUG-2003 (DSB):
-*        Original version.
-*     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 ShiftMap
-
-/* Include files. */
-/* ============== */
-/* Interface definitions. */
-/* ---------------------- */
-
-#include "globals.h"             /* Thread-safe global data access */
-#include "error.h"               /* Error reporting facilities */
-#include "memory.h"              /* Memory management facilities */
-#include "object.h"              /* Base Object class */
-#include "pointset.h"            /* Sets of points/coordinates */
-#include "matrixmap.h"           /* Linear mappings */
-#include "unitmap.h"             /* Unit mappings */
-#include "zoommap.h"             /* Zoom mappings */
-#include "permmap.h"             /* Axis permutations */
-#include "mapping.h"             /* Coordinate mappings (parent class) */
-#include "channel.h"             /* I/O channels */
-#include "winmap.h"              /* Window mappings */
-#include "shiftmap.h"            /* Interface definition for this class */
-
-/* Error code definitions. */
-/* ----------------------- */
-#include "ast_err.h"             /* AST error codes */
-
-/* C header files. */
-/* --------------- */
-#include <float.h>
-#include <math.h>
-#include <stdarg.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <string.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 * );
-
-
-#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(ShiftMap)
-
-/* Define macros for accessing each item of thread specific global data. */
-#define class_init astGLOBAL(ShiftMap,Class_Init)
-#define class_vtab astGLOBAL(ShiftMap,Class_Vtab)
-
-
-#include <pthread.h>
-
-
-#else
-
-
-/* Define the class virtual function table and its initialisation flag
-   as static variables. */
-static AstShiftMapVtab 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. */
-AstShiftMap *astShiftMapId_( int, const double [], const char *, ... );
-
-/* Prototypes for Private Member Functions. */
-/* ======================================== */
-
-static AstPointSet *Transform( AstMapping *, AstPointSet *, int, AstPointSet *, int * );
-static int GetObjSize( AstObject *, int * );
-static double Rate( AstMapping *, double *, int, int, 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 int Equal( AstObject *, AstObject *, int * );
-static int GetIsLinear( AstMapping *, int * );
-static int *MapSplit( AstMapping *, int, const int *, AstMapping **, int * );
-
-/* Member functions. */
-/* ================= */
-
-static int Equal( AstObject *this_object, AstObject *that_object, int *status ) {
-/*
-*  Name:
-*     Equal
-
-*  Purpose:
-*     Test if two ShiftMaps are equivalent.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     int Equal( AstObject *this, AstObject *that, int *status )
-
-*  Class Membership:
-*     ShiftMap 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 ShiftMaps are equivalent.
-
-*  Parameters:
-*     this
-*        Pointer to the first Object (a ShiftMap).
-*     that
-*        Pointer to the second Object.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Returned Value:
-*     One if the ShiftMaps 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: */
-   AstShiftMap *that;
-   AstShiftMap *this;
-   int i;
-   int nin;
-   int nout;
-   int result;
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain pointers to the two ShiftMap structures. */
-   this = (AstShiftMap *) this_object;
-   that = (AstShiftMap *) that_object;
-
-/* Check the second object is a ShiftMap. We know the first is a
-   ShiftMap since we have arrived at this implementation of the virtual
-   function. */
-   if( astIsAShiftMap( 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 ) {
-
-/* If the Invert flags for the two ShiftMaps differ, it may still be possible
-   for them to be equivalent. First compare the ShiftMaps if their Invert
-   flags are the same. In this case all the attributes of the two ShiftMaps
-   must be identical. */
-         if( astGetInvert( this ) == astGetInvert( that ) ) {
-            result = 1;
-            for( i = 0; i < nin; i++ ) {
-               if( !astEQUAL( this->shift[ i ], that->shift[ i ] ) ) {
-                  result = 0;
-                  break;
-               }
-            }
-
-/* If the Invert flags for the two ShiftMaps differ, the attributes of the two
-   ShiftMaps must be inversely related to each other. */
-         } else {
-
-            result = 1;
-            for( i = 0; i < nin; i++ ) {
-               if( !astEQUAL( this->shift[ i ], -(that->shift[ i ] ) ) ) {
-                  result = 0;
-                  break;
-               }
-            }
-
-         }
-      }
-   }
-
-/* If an error occurred, clear the result value. */
-   if ( !astOK ) result = 0;
-
-/* Return the result, */
-   return result;
-}
-
-static int GetIsLinear( AstMapping *this_mapping, int *status ){
-/*
-*  Name:
-*     GetIsLinear
-
-*  Purpose:
-*     Return the value of the IsLinear attribute for a ShiftMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "mapping.h"
-*     void GetIsLinear( AstMapping *this, int *status )
-
-*  Class Membership:
-*     ShiftMap member function (over-rides the protected astGetIsLinear
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function returns the value of the IsLinear attribute for a
-*     Frame, which is always one.
-
-*  Parameters:
-*     this
-*        Pointer to the ShiftMap.
-*     status
-*        Pointer to the inherited status variable.
-*/
-   return 1;
-}
-
-static int GetObjSize( AstObject *this_object, int *status ) {
-/*
-*  Name:
-*     GetObjSize
-
-*  Purpose:
-*     Return the in-memory size of an Object.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     int GetObjSize( AstObject *this, int *status )
-
-*  Class Membership:
-*     ShiftMap member function (over-rides the astGetObjSize protected
-*     method inherited from the parent class).
-
-*  Description:
-*     This function returns the in-memory size of the supplied ShiftMap,
-*     in bytes.
-
-*  Parameters:
-*     this
-*        Pointer to the ShiftMap.
-*     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: */
-   AstShiftMap *this;         /* Pointer to ShiftMap structure */
-   int result;                /* Result value to return */
-
-/* Initialise. */
-   result = 0;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Obtain a pointers to the ShiftMap structure. */
-   this = (AstShiftMap *) 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 += astTSizeOf( this->shift );
-
-/* If an error occurred, clear the result value. */
-   if ( !astOK ) result = 0;
-
-/* Return the result, */
-   return result;
-}
-
-void astInitShiftMapVtab_(  AstShiftMapVtab *vtab, const char *name, int *status ) {
-/*
-*+
-*  Name:
-*     astInitShiftMapVtab
-
-*  Purpose:
-*     Initialise a virtual function table for a ShiftMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     void astInitShiftMapVtab( AstShiftMapVtab *vtab, const char *name )
-
-*  Class Membership:
-*     ShiftMap vtab initialiser.
-
-*  Description:
-*     This function initialises the component of a virtual function
-*     table which is used by the ShiftMap 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 astIsAShiftMap) 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. */
-
-/* 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;
-
-   parent_transform = mapping->Transform;
-   mapping->Transform = Transform;
-
-/* Store replacement pointers for methods which will be over-ridden by
-   new member functions implemented here. */
-   object->Equal = Equal;
-   mapping->MapMerge = MapMerge;
-   mapping->Rate = Rate;
-   mapping->MapSplit = MapSplit;
-   mapping->GetIsLinear = GetIsLinear;
-
-/* Declare the class dump, copy and delete functions.*/
-   astSetDump( vtab, Dump, "ShiftMap", "Shift each coordinate axis" );
-   astSetCopy( (AstObjectVtab *) vtab, Copy );
-   astSetDelete( (AstObjectVtab *) vtab, Delete );
-
-/* 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) );
-   }
-}
-
-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 ShiftMap.
-
-*  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:
-*     ShiftMap 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 ShiftMap 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 ShiftMap with a Mapping 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 ShiftMap which is to be merged with
-*        its neighbours. This should be a cloned copy of the ShiftMap
-*        pointer contained in the array element "(*map_list)[where]"
-*        (see below). This pointer will not be annulled, and the
-*        ShiftMap it identifies will not be modified by this function.
-*     where
-*        Index in the "*map_list" array (below) at which the pointer
-*        to the nominated ShiftMap 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: */
-   AstWinMap *w1;        /* Pointer to replacement Mapping */
-   AstShiftMap *sm;      /* Pointer to this ShiftMap */
-   double *aa;           /* Pointer to shift terms for new WinMap */
-   double *bb;           /* Pointer to scale terms for new WinMap */
-   int i;                /* Axis count */
-   int nin;              /* Number of axes */
-   int result;           /* Returned value */
-
-/* Initialise. */
-   result = -1;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* A ShiftMap is equivalent to a WinMap with unit scaling. The policy on
-   simplifying a ShiftMap is to convert it to the equivalent WinMap and let
-   the WinMap class do the simplifying. Create the returned WinMap, initially
-   with undefined corners. */
-   nin = astGetNin( this );
-   w1 = astWinMap( nin, NULL, NULL, NULL, NULL, "", status );
-
-/* If succesful, store the scale and shift terms in the WinMap. The scale
-   terms are unity. */
-   if( astOK ){
-      sm = (AstShiftMap *) this;
-
-      bb = w1->b;
-      aa = w1->a;
-      for( i = 0; i < nin; i++ ) {
-         *(bb++) = 1.0;
-         *(aa++) = ( *invert_list )[ where ] ? -(sm->shift)[ i ] : (sm->shift)[ i ];
-      }
-
-/* Replace the supplied ShiftMap with the new WinMap and reset the invert
-   flag. */
-      (void) astAnnul( ( *map_list )[ where ] );
-      ( *map_list )[ where ] = (AstMapping *) w1;
-      ( *invert_list )[ where ] = 0;
-
-/* Return the index of the first modified element. */
-      result = where;
-   }
-
-/* 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
-*     ShiftMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     int *MapSplit( AstMapping *this, int nin, const int *in, AstMapping **map, int *status )
-
-*  Class Membership:
-*     ShiftMap 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 ShiftMap. This is only possible if the specified inputs
-*     correspond to some subset of the ShiftMap outputs. That is, there
-*     must exist a subset of the ShiftMap outputs for which each output
-*     depends only on the selected ShiftMap inputs, and not on any of the
-*     inputs which have not been selected. If this condition is not met
-*     by the supplied ShiftMap, then a NULL Mapping is returned.
-
-*  Parameters:
-*     this
-*        Pointer to the ShiftMap to be split (the ShiftMap 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 ShiftMap, 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 ShiftMap 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 ShiftMap. 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: */
-   AstShiftMap *newsm;        /* Pointer to returned ShiftMap */
-   AstShiftMap *this;         /* Pointer to ShiftMap structure */
-   int *result;               /* Pointer to returned array */
-   int i;                     /* Loop count */
-   int iin;                   /* Mapping input index */
-   int mnin;                  /* No. of Mapping inputs */
-   int ok;                    /* Are input indices OK? */
-
-/* Initialise */
-   result = NULL;
-   *map = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return result;
-
-/* Get a pointer to the ShiftMap structure. */
-   this = (AstShiftMap *) this_map;
-
-/* Allocate memory for the returned array and create a ShiftMap with the
-   required number of axes and initially unsorted shifts. */
-   result = astMalloc( sizeof( int )*(size_t) nin );
-   newsm = astShiftMap( nin, this->shift, "", status );
-   *map = (AstMapping *) newsm;
-
-/* Check pointers can be used safely. */
-   if( astOK ) {
-
-/* Store the required shifts in the new ShiftMap. At the same time check
-   that each axis is valid. */
-      mnin = astGetNin( this );
-      ok = 1;
-      for( i = 0; i < nin; i++ ) {
-         iin = in[ i ];
-         if( iin >= 0 && iin < mnin ) {
-            (newsm->shift)[ i ] = (this->shift)[ iin ];
-            result[ i ] = iin;
-         } else {
-            ok = 0;
-            break;
-         }
-      }
-
-/* If the "in" array contained any invalid values, free the returned
-   resources. */
-      if( !ok ) {
-         result = astFree( result );
-         *map = astAnnul( *map );
-
-/* If the indices are good, invert the returned ShiftMap if the supplied
-   ShiftMap is inverted. */
-      } else {
-         if( astGetInvert( this ) ) astInvert( *map );
-      }
-   }
-
-/* 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 "shiftmap.h"
-*     result = Rate( AstMapping *this, double *at, int ax1, int ax2, int *status )
-
-*  Class Membership:
-*     ShiftMap 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.
-
-*  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.
-
-*/
-
-   return ( ax1 == ax2 ) ? 1.0 : 0.0;
-}
-
-static AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-                               int forward, AstPointSet *out, int *status ) {
-/*
-*  Name:
-*     Transform
-
-*  Purpose:
-*     Apply a ShiftMap to transform a set of points.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     AstPointSet *Transform( AstMapping *this, AstPointSet *in,
-*                             int forward, AstPointSet *out, int *status )
-
-*  Class Membership:
-*     ShiftMap member function (over-rides the astTransform protected
-*     method inherited from the Mapping class).
-
-*  Description:
-*     This function takes a ShiftMap and a set of points encapsulated in a
-*     PointSet and transforms the points so as to map them into the
-*     required window.
-
-*  Parameters:
-*     this
-*        Pointer to the ShiftMap.
-*     in
-*        Pointer to the PointSet holding the input coordinate data.
-*     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 ShiftMap 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: */
-   AstPointSet *result;          /* Pointer to output PointSet */
-   AstShiftMap *map;             /* Pointer to ShiftMap to be applied */
-   const char *class;            /* Object class */
-   double **ptr_in;              /* Pointer to input coordinate data */
-   double **ptr_out;             /* Pointer to output coordinate data */
-   double *axin;                 /* Pointer to next input axis value */
-   double *axout;                /* Pointer to next output axis value */
-   double a;                     /* Shift for current axis */
-   int coord;                    /* Loop counter for coordinates */
-   int ncoord;                   /* Number of coordinates per point */
-   int npoint;                   /* Number of points */
-   int point;                    /* Loop counter for points */
-
-/* Check the global error status. */
-   if ( !astOK ) return NULL;
-
-/* Obtain a pointer to the ShiftMap. */
-   map = (AstShiftMap *) 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 will now extend the parent astTransform method by performing the
-   calculations needed to generate the output coordinate values. */
-
-/* Determine the numbers of points and coordinates per point from the input
-   PointSet and obtain pointers for accessing the input and output coordinate
-   values. */
-   ncoord = astGetNcoord( in );
-   npoint = astGetNpoint( in );
-   ptr_in = astGetPoints( in );
-   ptr_out = astGetPoints( result );
-
-/* 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;
-
-/* Report an error if the ShiftMap does not contain any shifts. */
-   if( !map->shift && astOK ){
-      class = astGetClass( this );
-      astError( AST__BADSM, "astTransform(%s): The supplied %s does not "
-                "contain any shift information.", status, class, class );
-   }
-
-/* Perform coordinate arithmetic. */
-/* ------------------------------ */
-   if( astOK ){
-
-/* Apply the mapping to each axis. */
-      for( coord = 0; coord < ncoord; coord++ ){
-
-/* Store pointers to the first input and output values on this axis. */
-         axin = ptr_in[ coord ];
-         axout = ptr_out[ coord ];
-
-/* Get the value to add to each axis value. */
-         a = (map->shift)[ coord ];
-
-/* If the shift is bad store bad output values. */
-         if( a == AST__BAD ){
-            for( point = 0; point < npoint; point++ ) *(axout++) = AST__BAD;
-
-/* Otherwise, shift this axis, taking account of whether the mapping is
-   inverted or not. */
-         } else {
-            if( !forward ) a = -a;
-
-            for( point = 0; point < npoint; point++ ){
-               if( *axin != AST__BAD ){
-                  *(axout++) = (*axin) + a;
-               } else {
-                  *(axout++) = AST__BAD;
-               }
-               axin++;
-            }
-         }
-      }
-   }
-
-/* Return a pointer to the output PointSet. */
-   return result;
-}
-
-/* Functions which access class attributes. */
-/* ---------------------------------------- */
-/* Implement member functions to access the attributes associated with
-   this class using the macros defined for this purpose in the
-   "object.h" file. For a description of each attribute, see the class
-   interface (in the associated .h file). */
-
-/* Copy constructor. */
-/* ----------------- */
-static void Copy( const AstObject *objin, AstObject *objout, int *status ) {
-/*
-*  Name:
-*     Copy
-
-*  Purpose:
-*     Copy constructor for ShiftMap objects.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     void Copy( const AstObject *objin, AstObject *objout, int *status )
-
-*  Description:
-*     This function implements the copy constructor for ShiftMap objects.
-
-*  Parameters:
-*     objin
-*        Pointer to the ShiftMap to be copied.
-*     objout
-*        Pointer to the ShiftMap being constructed.
-*     status
-*        Pointer to the inherited status variable.
-
-*/
-
-/* Local Variables: */
-   AstShiftMap *out;              /* Pointer to output ShiftMap */
-   AstShiftMap *in;               /* Pointer to input ShiftMap */
-   int ncoord;                  /* No. of axes for the mapping */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the input and output ShiftMaps. */
-   in= (AstShiftMap *) objin;
-   out = (AstShiftMap *) objout;
-
-/* Get the number of coordinates mapped by the ShiftMap. */
-   ncoord = astGetNin( in );
-
-/* Allocate memory holding copies of the shifts defining the mapping. */
-   out->shift = (double *) astStore( NULL, (void *) in->shift,
-                                     sizeof(double)*(size_t)ncoord );
-
-/* If an error occurred, free any allocated memory. */
-   if ( !astOK ) {
-      out->shift = (double *) astFree( (void *) out->shift );
-   }
-
-}
-
-/* Destructor. */
-/* ----------- */
-static void Delete( AstObject *obj, int *status ) {
-/*
-*  Name:
-*     Delete
-
-*  Purpose:
-*     Destructor for ShiftMap objects.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     void Delete( AstObject *obj, int *status )
-
-*  Description:
-*     This function implements the destructor for ShiftMap objects.
-
-*  Parameters:
-*     obj
-*        Pointer to the ShiftMap to be deleted.
-*     status
-*        Pointer to the inherited status variable.
-
-*  Notes:
-*     - This destructor does nothing and exists only to maintain a
-*     one-to-one correspondence between destructors and copy
-*     constructors.
-*/
-
-/* Local Variables: */
-   AstShiftMap *this;              /* Pointer to ShiftMap */
-
-/* Obtain a pointer to the ShiftMap structure. */
-   this = (AstShiftMap *) obj;
-
-/* Free the memory holding the shifts. */
-   this->shift = (double *) astFree( (void *) this->shift );
-
-}
-
-/* Dump function. */
-/* -------------- */
-static void Dump( AstObject *this_object, AstChannel *channel, int *status ) {
-/*
-*  Name:
-*     Dump
-
-*  Purpose:
-*     Dump function for ShiftMap 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 ShiftMap class to an output Channel.
-
-*  Parameters:
-*     this
-*        Pointer to the ShiftMap 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 Constants: */
-#define COMMENT_LEN 50           /* Maximum length of a comment string */
-#define KEY_LEN 50               /* Maximum length of a keyword */
-
-/* Local Variables: */
-   AstShiftMap *this;              /* Pointer to the ShiftMap structure */
-   char buff[ KEY_LEN + 1 ];     /* Buffer for keyword string */
-   char comment[ COMMENT_LEN + 1 ]; /* Buffer for comment string */
-   int axis;                     /* Axis index */
-   int ncoord;                   /* No. of axes for mapping */
-
-/* Check the global error status. */
-   if ( !astOK ) return;
-
-/* Obtain a pointer to the ShiftMap structure. */
-   this = (AstShiftMap *) this_object;
-
-/* Get the number of coordinates to be mapped. */
-   ncoord = astGetNin( this );
-
-/* Write out values representing the instance variables for the
-   ShiftMap class.  Accompany these with appropriate comment strings,
-   possibly depending on the values being written.*/
-
-/* The shifts. */
-   for( axis = 0; axis < ncoord; axis++ ){
-      (void) sprintf( buff, "Sft%d", axis + 1 );
-      (void) sprintf( comment, "Shift for axis %d", axis + 1 );
-      astWriteDouble( channel, buff, (this->shift)[ axis ] != 0.0, 0,
-                      (this->shift)[ axis ], comment );
-   }
-
-/* Undefine macros local to this function. */
-#undef COMMENT_LEN
-#undef KEY_LEN
-}
-
-/* Standard class functions. */
-/* ========================= */
-/* Implement the astIsAShiftMap and astCheckShiftMap functions using the macros
-   defined for this purpose in the "object.h" header file. */
-astMAKE_ISA(ShiftMap,Mapping)
-astMAKE_CHECK(ShiftMap)
-
-AstShiftMap *astShiftMap_( int ncoord, const double shift[], const char *options, int *status, ...) {
-/*
-*++
-*  Name:
-c     astShiftMap
-f     AST_SHIFTMAP
-
-*  Purpose:
-*     Create a ShiftMap.
-
-*  Type:
-*     Public function.
-
-*  Synopsis:
-c     #include "shiftmap.h"
-c     AstShiftMap *astShiftMap( int ncoord, const double shift[],
-c                               const char *options, ... )
-f     RESULT = AST_SHIFTMAP( NCOORD, SHIFT, OPTIONS, STATUS )
-
-*  Class Membership:
-*     ShiftMap constructor.
-
-*  Description:
-*     This function creates a new ShiftMap and optionally initialises its
-*     attributes.
-*
-*     A ShiftMap is a linear Mapping which shifts each axis by a
-*     specified constant value.
-
-*  Parameters:
-c     ncoord
-f     NCOORD = INTEGER (Given)
-*        The number of coordinate values for each point to be
-*        transformed (i.e. the number of dimensions of the space in
-*        which the points will reside). The same number is applicable
-*        to both input and output points.
-c     shift
-f     SHIFT( NCOORD ) = DOUBLE PRECISION (Given)
-*        An array containing the values to be added on to the input
-*        coordinates in order to create the output coordinates. A separate
-*        value should be supplied for each coordinate.
-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 ShiftMap. 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 ShiftMap. 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     astShiftMap()
-f     AST_SHIFTMAP = INTEGER
-*        A pointer to the new ShiftMap.
-
-*  Notes:
-*     - 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".
-
-*--
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstShiftMap *new;              /* Pointer to new ShiftMap */
-   va_list args;                  /* Variable argument list */
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* Initialise the ShiftMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-   new = astInitShiftMap( NULL, sizeof( AstShiftMap ), !class_init, &class_vtab,
-                        "ShiftMap", ncoord, shift );
-
-/* 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 ShiftMap'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 ShiftMap. */
-   return new;
-}
-
-AstShiftMap *astShiftMapId_( int ncoord, const double shift[],
-                             const char *options, ... ) {
-/*
-*  Name:
-*     astShiftMapId_
-
-*  Purpose:
-*     Create a ShiftMap.
-
-*  Type:
-*     Private function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     AstShiftMap *astShiftMapId_( int ncoord, const double shift[],
-*                                  const char *options, ... )
-
-*  Class Membership:
-*     ShiftMap constructor.
-
-*  Description:
-*     This function implements the external (public) interface to the
-*     astShiftMap constructor function. It returns an ID value (instead
-*     of a true C pointer) to external users, and must be provided
-*     because astShiftMap_ has a variable argument list which cannot be
-*     encapsulated in a macro (where this conversion would otherwise
-*     occur).
-*
-*     The variable argument list also prevents this function from
-*     invoking astShiftMap_ directly, so it must be a re-implementation
-*     of it in all respects, except for the final conversion of the
-*     result to an ID value.
-
-*  Parameters:
-*     As for astShiftMap_.
-
-*  Returned Value:
-*     The ID value associated with the new ShiftMap.
-*/
-
-/* Local Variables: */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-   AstShiftMap *new;            /* Pointer to new ShiftMap */
-   va_list args;                /* Variable argument list */
-
-   int *status;                  /* Pointer to inherited status value */
-
-/* Get a pointer to the inherited status value. */
-   status = astGetStatusPtr;
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(NULL);
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* Initialise the ShiftMap, allocating memory and initialising the
-   virtual function table as well if necessary. */
-   new = astInitShiftMap( NULL, sizeof( AstShiftMap ), !class_init, &class_vtab,
-                          "ShiftMap", ncoord, shift );
-
-/* 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 ShiftMap'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 ShiftMap. */
-   return astMakeId( new );
-}
-
-AstShiftMap *astInitShiftMap_( void *mem, size_t size, int init,
-                              AstShiftMapVtab *vtab, const char *name,
-                              int ncoord, const double *shift, int *status ) {
-/*
-*+
-*  Name:
-*     astInitShiftMap
-
-*  Purpose:
-*     Initialise a ShiftMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     AstShiftMap *astInitShiftMap( void *mem, size_t size, int init,
-*                                   AstShiftMapVtab *vtab, const char *name,
-*                                   int ncoord, const double *shift )
-
-*  Class Membership:
-*     ShiftMap initialiser.
-
-*  Description:
-*     This function is provided for use by class implementations to initialise
-*     a new ShiftMap object. It allocates memory (if necessary) to accommodate
-*     the ShiftMap plus any additional data associated with the derived class.
-*     It then initialises a ShiftMap 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 ShiftMap at the start of the memory passed via the
-*     "vtab" parameter.
-
-*  Parameters:
-*     mem
-*        A pointer to the memory in which the ShiftMap is to be initialised.
-*        This must be of sufficient size to accommodate the ShiftMap data
-*        (sizeof(ShiftMap)) 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 ShiftMap (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 ShiftMap
-*        structure, so a valid value must be supplied even if not required for
-*        allocating memory.
-*     init
-*        A logical flag indicating if the ShiftMap'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 ShiftMap.
-*     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).
-*     ncoord
-*        The number of coordinate values per point.
-*     shift
-*        Pointer to an array of shifts, one for each coordinate.
-
-*  Returned Value:
-*     A pointer to the new ShiftMap.
-
-*  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: */
-   AstShiftMap *new;            /* Pointer to new ShiftMap */
-   int axis;                    /* Axis index */
-
-/* Check the global status. */
-   if ( !astOK ) return NULL;
-
-/* If necessary, initialise the virtual function table. */
-   if ( init ) astInitShiftMapVtab( vtab, name );
-
-/* Initialise. */
-   new = NULL;
-
-/* Initialise a Mapping structure (the parent class) as the first component
-   within the ShiftMap structure, allocating memory if necessary. Specify that
-   the Mapping should be defined in both the forward and inverse directions. */
-   new = (AstShiftMap *) astInitMapping( mem, size, 0,
-                                         (AstMappingVtab *) vtab, name,
-                                         ncoord, ncoord, 1, 1 );
-
-   if ( astOK ) {
-
-/* Initialise the ShiftMap data. */
-/* ---------------------------- */
-/* Allocate memory to hold the shift for each axis. */
-      new->shift = (double *) astMalloc( sizeof(double)*(size_t)ncoord );
-
-/* Check the pointers can be used */
-      if( astOK ){
-
-/* Store the shift and scale for each axis. */
-         for( axis = 0; axis < ncoord; axis++ ){
-            (new->shift)[ axis ] = shift ? shift[ axis ] : AST__BAD;
-         }
-
-      }
-
-/* If an error occurred, clean up by deleting the new ShiftMap. */
-      if ( !astOK ) new = astDelete( new );
-   }
-
-/* Return a pointer to the new ShiftMap. */
-   return new;
-}
-
-AstShiftMap *astLoadShiftMap_( void *mem, size_t size,
-                               AstShiftMapVtab *vtab, const char *name,
-                               AstChannel *channel, int *status ) {
-/*
-*+
-*  Name:
-*     astLoadShiftMap
-
-*  Purpose:
-*     Load a ShiftMap.
-
-*  Type:
-*     Protected function.
-
-*  Synopsis:
-*     #include "shiftmap.h"
-*     AstShiftMap *astLoadShiftMap( void *mem, size_t size,
-*                                   AstShiftMapVtab *vtab, const char *name,
-*                                   AstChannel *channel )
-
-*  Class Membership:
-*     ShiftMap loader.
-
-*  Description:
-*     This function is provided to load a new ShiftMap 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
-*     ShiftMap 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 ShiftMap at the start of the memory
-*     passed via the "vtab" parameter.
-
-
-*  Parameters:
-*     mem
-*        A pointer to the memory into which the ShiftMap is to be
-*        loaded.  This must be of sufficient size to accommodate the
-*        ShiftMap data (sizeof(ShiftMap)) 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 ShiftMap (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 ShiftMap 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(AstShiftMap) is used instead.
-*     vtab
-*        Pointer to the start of the virtual function table to be
-*        associated with the new ShiftMap. If this is NULL, a pointer
-*        to the (static) virtual function table for the ShiftMap 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 "ShiftMap" is used instead.
-
-*  Returned Value:
-*     A pointer to the new ShiftMap.
-
-*  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 Constants. */
-   astDECLARE_GLOBALS            /* Pointer to thread-specific global data */
-#define KEY_LEN 50               /* Maximum length of a keyword */
-
-/* Local Variables: */
-   AstShiftMap *new;            /* Pointer to the new ShiftMap */
-   char buff[ KEY_LEN + 1 ];    /* Buffer for keyword string */
-   int axis;                    /* Axis index */
-   int ncoord;                  /* The number of coordinate axes */
-
-/* Get a pointer to the thread specific global data structure. */
-   astGET_GLOBALS(channel);
-
-/* Initialise. */
-   new = NULL;
-
-/* Check the global error status. */
-   if ( !astOK ) return new;
-
-/* If a NULL virtual function table has been supplied, then this is
-   the first loader to be invoked for this ShiftMap. In this case the
-   ShiftMap belongs to this class, so supply appropriate values to be
-   passed to the parent class loader (and its parent, etc.). */
-   if ( !vtab ) {
-      size = sizeof( AstShiftMap );
-      vtab = &class_vtab;
-      name = "ShiftMap";
-
-/* If required, initialise the virtual function table for this class. */
-      if ( !class_init ) {
-         astInitShiftMapVtab( 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 ShiftMap. */
-   new = astLoadMapping( mem, size, (AstMappingVtab *) vtab, name,
-                         channel );
-
-   if ( astOK ) {
-
-/* Get the number of axis for the mapping. */
-      ncoord = astGetNin( (AstMapping *) new );
-
-/* Allocate memory to hold the shifts. */
-      new->shift = (double *) astMalloc( sizeof(double)*(size_t)ncoord );
-
-/* Read input data. */
-/* ================ */
-/* Request the input Channel to read all the input data appropriate to
-   this class into the internal "values list". */
-      astReadClassData( channel, "ShiftMap" );
-
-/* Now read each individual data item from this list and use it to
-   initialise the appropriate instance variable(s) for this class. */
-
-/* The shifts. */
-      for( axis = 0; axis < ncoord; axis++ ){
-         (void) sprintf( buff, "sft%d", axis + 1 );
-         (new->shift)[ axis ] = astReadDouble( channel, buff, 0.0 );
-      }
-   }
-
-/* If an error occurred, clean up by deleting the new ShiftMap. */
-   if ( !astOK ) new = astDelete( new );
-
-/* Return the new ShiftMap pointer. */
-   return new;
-
-/* Undefine macros local to this function. */
-#undef KEY_LEN
-}
-
-/* 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. */
-
-
-
-
-