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+'\"
+'\" Copyright (c) 1996-1997 Sun Microsystems, Inc.
+'\"
+'\" See the file "license.terms" for information on usage and redistribution
+'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+'\" 
+'\" SCCS: @(#) @(#) BoolObj.3 1.7 97/05/08 19:50:57
+'\" 
+.so man.macros
+.TH Tcl_BooleanObj 3 8.0 Tcl "Tcl Library Procedures"
+.BS
+.SH NAME
+Tcl_NewBooleanObj, Tcl_SetBooleanObj, Tcl_GetBooleanFromObj \- manipulate Tcl objects as boolean values
+.SH SYNOPSIS
+.nf
+\fB#include <tcl.h>\fR
+.sp
+Tcl_Obj *
+\fBTcl_NewBooleanObj\fR(\fIboolValue\fR)
+.sp
+\fBTcl_SetBooleanObj\fR(\fIobjPtr, boolValue\fR)
+.sp
+int
+\fBTcl_GetBooleanFromObj\fR(\fIinterp, objPtr, boolPtr\fR)
+.SH ARGUMENTS
+.AS Tcl_Interp *interp
+.AP int boolValue in
+Integer value used to initialize 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.
+.AP Tcl_Obj *objPtr in/out
+For \fBTcl_SetBooleanObj\fR, this points to the object to be converted
+to boolean type.
+For \fBTcl_GetBooleanFromObj\fR, this refers to the object
+from which to get a boolean value; 
+if \fIobjPtr\fR does not already point to a boolean object,
+an attempt will be made to convert it to one.
+.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.
+.AP int *boolPtr out
+Points to place where \fBTcl_GetBooleanFromObj\fR
+stores the boolean value (0 or 1) obtained from \fIobjPtr\fR.
+.BE
+
+.SH DESCRIPTION
+.PP
+These procedures are used to create, modify, and read
+boolean Tcl objects from C code.
+\fBTcl_NewBooleanObj\fR and \fBTcl_SetBooleanObj\fR
+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 \fIboolValue\fR;
+if \fIboolValue\fR is nonzero, the object is set to 1,
+otherwise to 0.
+\fBTcl_NewBooleanObj\fR 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 internal representation
+\fIlongValue\fR member.
+\fBTcl_SetBooleanObj\fR invalidates any old string representation
+and, if the object is not already a boolean object,
+frees any old internal representation.
+.PP
+\fBTcl_GetBooleanFromObj\fR attempts to return a boolean value
+from the Tcl object \fIobjPtr\fR.
+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 \fBTCL_ERROR\fR
+and leaves an error message in the interpreter's result object
+unless \fIinterp\fR is NULL.
+Otherwise, \fBTcl_GetBooleanFromObj\fR returns \fBTCL_OK\fR
+and stores the boolean value in the address given by \fIboolPtr\fR.
+If the object is not already a boolean object,
+the conversion will free any old internal representation.
+
+.SH "SEE ALSO"
+Tcl_NewObj, Tcl_DecrRefCount, Tcl_IncrRefCount, Tcl_GetObjResult
+
+.SH KEYWORDS
+boolean, boolean object, boolean type, internal representation, object, object type, string representation