Tcl Source Code

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.so man.macros
.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, Tcl_NewBignumObj, Tcl_SetBignumObj, Tcl_GetBignumFromObj, Tcl_GetBignumAndClearObj \- manipulate Tcl_Obj values as integers
.SH SYNOPSIS
.nf
\fB#include <tcl.h>\fR
.sp
Tcl_Obj *
\fBTcl_NewIntObj\fR(\fIintValue\fR)
.sp

\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
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.
.AP long *longPtr out
Points to place to store the long integer value
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
.VS 8.5
These procedures are used to create, modify, and read Tcl objects

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. Unlike the other functions,
\fBTcl_GetBignumAndClearObj\fR may set the content of the Tcl object
\fIobjPtr\fR to an empty string in the process of retrieving the
multiple-precision integer library.
.PP
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