Provided by: tcl8.5-doc_8.5.19-4_all 
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_TakeBignumFromObj -
manipulate Tcl objects as integer values
SYNOPSIS
#include <tcl.h>
Tcl_Obj *
Tcl_NewIntObj(intValue)
Tcl_Obj *
Tcl_NewLongObj(longValue)
Tcl_Obj *
Tcl_NewWideIntObj(wideValue)
Tcl_SetIntObj(objPtr, intValue)
Tcl_SetLongObj(objPtr, longValue)
Tcl_SetWideIntObj(objPtr, wideValue)
int
Tcl_GetIntFromObj(interp, objPtr, intPtr)
int
Tcl_GetLongFromObj(interp, objPtr, longPtr)
int
Tcl_GetWideIntFromObj(interp, objPtr, widePtr)
#include <tclTomMath.h> │
Tcl_Obj * │
Tcl_NewBignumObj(bigValue) │
Tcl_SetBignumObj(objPtr, bigValue) │
int │
Tcl_GetBignumFromObj(interp, objPtr, bigValue) │
int │
Tcl_TakeBignumFromObj(interp, objPtr, bigValue) │
int │
Tcl_InitBignumFromDouble(interp, doubleValue, bigValue) │
ARGUMENTS
int intValue (in) Integer value used to initialize or set a Tcl
object.
long longValue (in) Long integer value used to initialize or set a Tcl
object.
Tcl_WideInt wideValue (in) Wide integer value used to initialize or set a Tcl
object.
Tcl_Obj *objPtr (in/out) For Tcl_SetIntObj, Tcl_SetLongObj,
Tcl_SetWideIntObj, and Tcl_SetBignumObj, this points
to the object in which to store an integral value.
For Tcl_GetIntFromObj, Tcl_GetLongFromObj,
Tcl_GetWideIntFromObj, Tcl_GetBignumFromObj, and
Tcl_TakeBignumFromObj, this refers to the object
from which to retrieve an integral value.
Tcl_Interp *interp (in/out) When non-NULL, an error message is left here when
integral value retrieval fails.
int *intPtr (out) Points to place to store the integer value retrieved
from objPtr.
long *longPtr (out) Points to place to store the long integer value
retrieved from objPtr.
Tcl_WideInt *widePtr (out) Points to place to store the wide integer value
retrieved from objPtr.
mp_int *bigValue (in/out) Points to a multi-precision integer structure │
declared by the LibTomMath library.
double doubleValue (in) Double value from which the integer part is │
determined and used to initialize a multi-precision │
integer value.
_________________________________________________________________________________________________
DESCRIPTION
These procedures are used to create, modify, and read Tcl objects that hold integral │
values. │
The different routines exist to accommodate different integral types in C with which │
values might be exchanged. The C integral types for which Tcl provides value exchange │
routines are int, long int, Tcl_WideInt, and mp_int. The int and long int types are │
provided by the C language standard. The Tcl_WideInt type is a typedef defined to be │
whatever signed integral type covers at least the 64-bit integer range │
(-9223372036854775808 to 9223372036854775807). Depending on the platform and the C │
compiler, the actual type might be long int, long long int, int64, or something else. The │
mp_int type is a multiple-precision integer type defined by the LibTomMath multiple- │
precision integer library. │
The Tcl_NewIntObj, Tcl_NewLongObj, Tcl_NewWideIntObj, and Tcl_NewBignumObj routines each │
create and return a new Tcl object initialized to the integral value of the argument. The │
returned Tcl object is unshared. │
The Tcl_SetIntObj, Tcl_SetLongObj, Tcl_SetWideIntObj, and Tcl_SetBignumObj routines each │
set the value of an existing Tcl object pointed to by objPtr to the integral value │
provided by the other argument. The objPtr 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. │
The Tcl_GetIntFromObj, Tcl_GetLongFromObj, Tcl_GetWideIntFromObj, Tcl_GetBignumFromObj, │
and Tcl_TakeBignumFromObj routines attempt to retrieve an integral value of the │
appropriate type from the Tcl object objPtr. If the attempt succeeds, then TCL_OK is │
returned, and the value is written to the storage provided by the caller. The attempt │
might fail if objPtr does not hold an integral value, or if the value exceeds the range of │
the target type. If the attempt fails, then TCL_ERROR is returned, and if interp is non- │
NULL, an error message is left in interp. The Tcl_ObjType of objPtr may be changed to │
make subsequent calls to the same routine more efficient. Unlike the other functions, │
Tcl_TakeBignumFromObj may set the content of the Tcl object objPtr to an empty string in │
the process of retrieving the multiple-precision integer value. │
The choice between Tcl_GetBignumFromObj and Tcl_TakeBignumFromObj is governed by how the │
caller will continue to use objPtr. If after the mp_int value is retrieved from objPtr, │
the caller will make no more use of objPtr, then using Tcl_TakeBignumFromObj permits Tcl │
to detect when an unshared objPtr permits the value to be moved instead of copied, which │
should be more efficient. If anything later in the caller requires objPtr to continue to │
hold the same value, then Tcl_GetBignumFromObj must be chosen. │
The Tcl_InitBignumFromDouble routine is a utility procedure that extracts the integer part │
of doubleValue and stores that integer value in the mp_int value bigValue.
SEE ALSO
Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult
KEYWORDS
integer, integer object, integer type, internal representation, object, object type,
string representation