tcl_getbignumfromobj(3) - Linux man page

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 accomodate 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.

Keywords