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Diffstat (limited to 'doc/IntObj.3')
| -rw-r--r-- | doc/IntObj.3 | 153 |
1 files changed, 87 insertions, 66 deletions
diff --git a/doc/IntObj.3 b/doc/IntObj.3 index 3bdac48..f03e355 100644 --- a/doc/IntObj.3 +++ b/doc/IntObj.3 @@ -4,13 +4,13 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: IntObj.3,v 1.8 2005/05/10 18:33:56 kennykb Exp $ +'\" RCS: @(#) $Id: IntObj.3,v 1.9 2006/04/17 21:00:47 dgp Exp $ '\" .so man.macros -.TH Tcl_IntObj 3 8.0 Tcl "Tcl Library Procedures" +.TH Tcl_IntObj 3 8.5 Tcl "Tcl Library Procedures" .BS .SH NAME -Tcl_NewIntObj, Tcl_NewLongObj, Tcl_NewWideIntObj, Tcl_SetIntObj, Tcl_SetLongObj, Tcl_SetWideIntObj, Tcl_GetIntFromObj, Tcl_GetLongFromObj, Tcl_GetWideIntFromObj \- manipulate Tcl objects as integers and wide integers +Tcl_NewIntObj, Tcl_NewLongObj, Tcl_NewWideIntObj, Tcl_SetIntObj, Tcl_SetLongObj, Tcl_SetWideIntObj, Tcl_GetIntFromObj, Tcl_GetLongFromObj, Tcl_GetWideIntFromObj, Tcl_NewBignumObj, Tcl_SetBignumObj, Tcl_GetBignumFromObj, Tcl_GetBignumAndClearObj \- manipulate Tcl_Obj values as integers .SH SYNOPSIS .nf \fB#include <tcl.h>\fR @@ -24,6 +24,7 @@ Tcl_Obj * Tcl_Obj * \fBTcl_NewWideIntObj\fR(\fIwideValue\fR) .sp +.sp \fBTcl_SetIntObj\fR(\fIobjPtr, intValue\fR) .sp \fBTcl_SetLongObj\fR(\fIobjPtr, longValue\fR) @@ -38,28 +39,38 @@ int .sp int \fBTcl_GetWideIntFromObj\fR(\fIinterp, objPtr, widePtr\fR) +.sp +.VS 8.5 +\fB#include <tclTomMath.h>\fR +.sp +Tcl_Obj * +\fBTcl_NewBignumObj\fR(\fIbigValue\fR) +.sp +\fBTcl_SetBignumObj\fR(\fIobjPtr, bigValue\fR) +int +\fBTcl_GetBignumFromObj\fR(\fIinterp, objPtr, bigValue\fR) +.sp +int +\fBTcl_GetBignumAndClearObj\fR(\fIinterp, objPtr, bigValue\fR) +.VE 8.5 .SH ARGUMENTS .AS Tcl_WideInt longValue in/out .AP int intValue in -Integer value used to initialize or set an integer object. +Integer value used to initialize or set a Tcl object. .AP long longValue in -Long integer value used to initialize or set an integer object. +Long integer value used to initialize or set a Tcl object. .AP Tcl_WideInt wideValue in -Wide integer value (minimum 64-bits wide where supported by the -compiler) used to initialize or set a wide integer object. +Wide integer value used to initialize or set a Tcl object. .AP Tcl_Obj *objPtr in/out -For \fBTcl_SetIntObj\fR, \fBTcl_SetLongObj\fR, and -\fBTcl_SetWideIntObj\fR, this points to the object to be converted to -integer type. For \fBTcl_GetIntFromObj\fR, \fBTcl_GetLongFromObj\fR, -and \fBTcl_GetWideIntFromObj\fR, this refers to the object from which -to get an integer or long integer value; if \fIobjPtr\fR does not -already point to an integer object (or a wide integer object in the -case of \fBTcl_SetWideIntObj\fR and \fBTcl_GetWideIntFromObj\fR), an -attempt will be made to convert it to one. +For \fBTcl_SetIntObj\fR, \fBTcl_SetLongObj\fR, \fBTcl_SetWideIntObj\fR, +and \fBTcl_SetBignumObj\fR, this points to the object in which to store an +integral value. For \fBTcl_GetIntFromObj\fR, \fBTcl_GetLongFromObj\fR, +\fBTcl_GetWideIntFromObj\fR, \fBTcl_GetBignumFromObj\fR, and +\fBTcl_GetBignumAndClearObj\fR, this refers to the object from which +to retrieve an integral value. .AP Tcl_Interp *interp in/out -If an error occurs during conversion, -an error message is left in the interpreter's result object -unless \fIinterp\fR is NULL. +When non-NULL, an error message is left here when integral value +retrieval fails. .AP int *intPtr out Points to place to store the integer value obtained by \fBTcl_GetIntFromObj\fR from \fIobjPtr\fR. @@ -69,58 +80,68 @@ obtained by \fBTcl_GetLongFromObj\fR from \fIobjPtr\fR. .AP Tcl_WideInt *widePtr out Points to place to store the wide integer value obtained by \fBTcl_GetWideIntFromObj\fR from \fIobjPtr\fR. +.AP mp_int *bigValue in/out +.VS 8.5 +Points to a multi-precision integer structure consistent with +one declared by headers of the libtommath library. +.VE 8.5 .BE - .SH DESCRIPTION .PP -These procedures are used to create, modify, and read -integer and wide integer Tcl objects from C code. -\fBTcl_NewIntObj\fR, \fBTcl_NewLongObj\fR, -\fBTcl_SetIntObj\fR, and \fBTcl_SetLongObj\fR -create a new object of integer type -or modify an existing object to have integer type, -and \fBTcl_NewWideIntObj\fR and \fBTcl_SetWideIntObj\fR create a new -object of wide integer type or modify an existing object to have wide -integer type. -\fBTcl_NewIntObj\fR and \fBTcl_SetIntObj\fR set the object to have the -integer value given by \fIintValue\fR, -\fBTcl_NewLongObj\fR and \fBTcl_SetLongObj\fR -set the object to have the -long integer value given by \fIlongValue\fR, -and \fBTcl_NewWideIntObj\fR and \fBTcl_SetWideIntObj\fR set the object -to have the wide integer value given by \fIwideValue\fR. -\fBTcl_NewIntObj\fR, \fBTcl_NewLongObj\fR and \fBTcl_NewWideIntObj\fR -return a pointer to a newly created object with reference count zero. -These procedures set the object's type to be integer -and assign the integer value to the object's internal representation -\fIlongValue\fR or \fIwideValue\fR member (as appropriate). -\fBTcl_SetIntObj\fR, \fBTcl_SetLongObj\fR -and \fBTcl_SetWideIntObj\fR -invalidate any old string representation and, -if the object is not already an integer object, -free any old internal representation. +.VS 8.5 +These procedures are used to create, modify, and read Tcl objects +that hold integral values. +.PP +The different routines exist to accomodate different integral types in C +with which values might be exchanged. The C integral types for which Tcl +provides value exchange routines are \fBint\fR, \fBlong int\fR, +\fBTcl_WideInt\fR, and \fBmp_int\fR. The \fBint\fR and \fBlong int\fR types +are provided by the C language standard. The \fBTcl_WideInt\fR type is a +typedef defined to be whatever signed integral type covers at least the +64-bit integer range (-9223372036854775809 to 9223372036854775807). Depending +on the platform and the C compiler, the actual type might be +\fBlong int\fR, \fBlong long int\fR, \fBint64\fR, or something else. +The \fBmp_int\fR type is a multiple-precision integer type defined +by the LibTomMath multiple-precision integer library. +.PP +The \fBTcl_NewIntObj\fR, \fBTcl_NewLongObj\fR, \fBTcl_NewWideIntObj\fR, +and \fBTcl_NewBignumObj\fR routines each create and return a new +Tcl object initialized to the integral value of the argument. The +returned Tcl object is unshared. +.PP +The \fBTcl_SetIntObj\fR, \fBTcl_SetLongObj\fR, \fBTcl_SetWideIntObj\fR, +and \fBTcl_SetBignumObj\fR routines each set the value of an existing +\fBTcl_Obj\fR pointed to by \fIobjPtr\fR to the integral value provided +by the other argument. The \fIobjPtr\fR argument must point to an +unshared Tcl object. Any attempt to set the value of a shared Tcl object +violates Tcl's copy-on-write policy. Any existing string representation +or internal representation in the unshared Tcl object will be freed +as a consequence of setting the new value. +.PP +The \fBTcl_GetIntFromObj\fR, \fBTcl_GetLongFromObj\fR, +\fBTcl_GetWideIntFromObj\fR, \fBTcl_GetBignumFromObj\fR, and +\fBTcl_GetBignumAndClearObj\fR attempt to retrieve an integral value +of the appropriate type from the Tcl object \fIobjPtr\fR. If the +attempt succeeds, then \fBTCL_OK\fR is returned, and the value is +written to the storage provided by the caller. The attempt might +fail if \fIobjPtr\fR does not hold an integral value, or if the +value exceeds the range of the target type. If the attempt fails, +then \fBTCL_ERROR\fR is returned, and if \fIinterp\fR is non-NULL, +an error message is left in \fIinterp\fR. The \fBTcl_ObjType\fR +of \fIobjPtr\fR may be changed to make subsequent calls to the +same routine more efficient. .PP -\fBTcl_GetIntFromObj\fR and \fBTcl_GetLongFromObj\fR -attempt to return an integer value from the Tcl object \fIobjPtr\fR, -and \fBTcl_GetWideIntFromObj\fR attempts to return a wide integer -value from the Tcl object \fIobjPtr\fR. -If the object is not already an integer object, -or a wide integer object in the case of \fBTcl_GetWideIntFromObj\fR -they will attempt to convert it to one. -If an error occurs during conversion, they return \fBTCL_ERROR\fR -and leave an error message in the interpreter's result object -unless \fIinterp\fR is NULL. -Also, if the long integer held in the object's internal representation -\fIlongValue\fR member can not be represented in a (non-long) integer, -\fBTcl_GetIntFromObj\fR returns \fBTCL_ERROR\fR -and leaves an error message in the interpreter's result object -unless \fIinterp\fR is NULL. -Otherwise, all three procedures return \fBTCL_OK\fR and -store the integer, long integer value -or wide integer in the address given by \fIintPtr\fR, \fIlongPtr\fR -and \fIwidePtr\fR -respectively. If the object is not already an integer or wide integer -object, the conversion will free any old internal representation. +The choice between \fBTcl_GetBignumFromObj\fR and +\fBTcl_GetBignumAndClearObj\fR is governed by how the caller will +continue to use \fIobjPtr\fR. If after the \fBmp_int\fR value +is retrieved from \fIobjPtr\fR, the caller will make no more +use of \fIobjPtr\fR, and in addition if \fIobjPtr\fR is unshared, +then using \fBTcl_GetBignumAndClearObj\fR requires less copying +to get the same job done, and should be more efficient. If +\fIobjPtr\fR is shared, or if anything later in the caller requires +\fIobjPtr\fR to continue to hold the same value, then +\fBTcl_GetBignumFromObj\fR must be chosen. +.VE 8.5 .SH "SEE ALSO" Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult |