About Us Documentation

Contact Site Map
 

  

WinPak
Documentation

BoolObj





Tcl_BooleanObj(3)    Tcl Library Procedures                   8.0



_________________________________________________________________

NAME

Tcl_NewBooleanObj, Tcl_SetBooleanObj, Tcl_GetBooleanFromObj - manipulate Tcl objects as boolean values

SYNOPSIS

#include <tcl.h> Tcl_Obj * Tcl_NewBooleanObj(boolValue) Tcl_SetBooleanObj(objPtr, boolValue) int Tcl_GetBooleanFromObj(interp, objPtr, boolPtr)

ARGUMENTS

int boolValue (in) Integer value used to ini- tialize or set a boolean object. If the integer is nonzero, the boolean object is set to 1; otherwise the boolean object is set to 0. Tcl_Obj *objPtr (in/out) For Tcl_SetBooleanObj, this points to the object to be converted to boolean type. For Tcl_GetBooleanFromObj, this refers to the object from which to get a boolean value; if objPtr does not already point to a boolean object, an attempt will be made to convert it to one. Tcl_Interp *interp (in/out) If an error occurs during conversion, an error mes- sage is left in the interpreter's result object unless interp is NULL. int *boolPtr (out) Points to place where Tcl_GetBooleanFromObj stores the boolean value (0 or 1) obtained from objPtr. _________________________________________________________________

DESCRIPTION

These procedures are used to create, modify, and read boolean Tcl objects from C code. Tcl_NewBooleanObj and Tcl 1 Tcl_BooleanObj(3) Tcl Library Procedures 8.0 Tcl_SetBooleanObj will create a new object of boolean type or modify an existing object to have boolean type. Both of these procedures set the object to have the boolean value (0 or 1) specified by boolValue; if boolValue is nonzero, the object is set to 1, otherwise to 0. Tcl_NewBooleanObj returns a pointer to a newly created object with reference count zero. Both procedures set the object's type to be boolean and assign the boolean value to the object's inter- nal representation longValue member. Tcl_SetBooleanObj invalidates any old string representation and, if the object is not already a boolean object, frees any old internal representation. Tcl_GetBooleanFromObj attempts to return a boolean value from the Tcl object objPtr. If the object is not already a boolean object, it will attempt to convert it to one. If an error occurs during conversion, it returns TCL_ERROR and leaves an error message in the interpreter's result object unless interp is NULL. Otherwise, Tcl_GetBooleanFromObj returns TCL_OK and stores the boolean value in the address given by boolPtr. If the object is not already a boolean object, the conversion will free any old internal represen- tation.

SEE ALSO

Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult

KEYWORDS

boolean, boolean object, boolean type, internal representa- tion, object, object type, string representation Tcl 2 Prepared by Ready-to-Run Software, Inc.

 

Email addresses listed on this site may  NOT be used for unsolicited commercial email.

Ready-to-Run Software, Inc Privacy Statement

Portions (c)Copyright, 1996-2005 by Ready-to-Run Software, Inc
(All rights reserved.)
212 Cedar Cove
Lansing, NY 14882
Phone: 607 533 UNIX (8649)
Fax: 607 533 4002


To return to the Ready-to-Run Software WinPak Table of contents please presshere