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authorWilliam Joye <wjoye@cfa.harvard.edu>2018-01-02 20:34:49 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2018-01-02 20:34:49 (GMT)
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-'\"
-'\" Copyright (c) 1996-1997 Sun Microsystems, Inc.
-'\" Contributions from Don Porter, NIST, 2005. (not subject to US copyright)
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_BooleanObj 3 8.5 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_NewBooleanObj, Tcl_SetBooleanObj, Tcl_GetBooleanFromObj \- store/retrieve boolean value in a Tcl_Obj
-.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 boolValue in/out
-.AP int boolValue in
-Integer value to be stored as a boolean value in a Tcl_Obj.
-.AP Tcl_Obj *objPtr in/out
-Points to the Tcl_Obj in which to store, or from which to
-retrieve a boolean value.
-.AP Tcl_Interp *interp in/out
-If a boolean value cannot be retrieved,
-an error message is left in the interpreter's result value
-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 pass boolean values to and from
-Tcl as Tcl_Obj's. When storing a boolean value into a Tcl_Obj,
-any non-zero integer value in \fIboolValue\fR is taken to be
-the boolean value \fB1\fR, and the integer value \fB0\fR is
-taken to be the boolean value \fB0\fR.
-.PP
-\fBTcl_NewBooleanObj\fR creates a new Tcl_Obj, stores the boolean
-value \fIboolValue\fR in it, and returns a pointer to the new Tcl_Obj.
-The new Tcl_Obj has reference count of zero.
-.PP
-\fBTcl_SetBooleanObj\fR accepts \fIobjPtr\fR, a pointer to
-an existing Tcl_Obj, and stores in the Tcl_Obj \fI*objPtr\fR
-the boolean value \fIboolValue\fR. This is a write operation
-on \fI*objPtr\fR, so \fIobjPtr\fR must be unshared. Attempts to
-write to a shared Tcl_Obj will panic. A successful write
-of \fIboolValue\fR into \fI*objPtr\fR implies the freeing of
-any former value stored in \fI*objPtr\fR.
-.PP
-\fBTcl_GetBooleanFromObj\fR attempts to retrieve a boolean value
-from the value stored in \fI*objPtr\fR.
-If \fIobjPtr\fR holds a string value recognized by \fBTcl_GetBoolean\fR,
-then the recognized boolean value is written at the address given
-by \fIboolPtr\fR.
-If \fIobjPtr\fR holds any value recognized as
-a number by Tcl, then if that value is zero a 0 is written at
-the address given by \fIboolPtr\fR and if that
-value is non-zero a 1 is written at the address given by \fIboolPtr\fR.
-In all cases where a value is written at the address given
-by \fIboolPtr\fR, \fBTcl_GetBooleanFromObj\fR returns \fBTCL_OK\fR.
-If the value of \fIobjPtr\fR does not meet any of the conditions
-above, then \fBTCL_ERROR\fR is returned and an error message is
-left in the interpreter's result unless \fIinterp\fR is NULL.
-\fBTcl_GetBooleanFromObj\fR may also make changes to the internal
-fields of \fI*objPtr\fR so that future calls to
-\fBTcl_GetBooleanFromObj\fR on the same \fIobjPtr\fR can be
-performed more efficiently.
-.PP
-Note that the routines \fBTcl_GetBooleanFromObj\fR and
-\fBTcl_GetBoolean\fR are not functional equivalents.
-The set of values for which \fBTcl_GetBooleanFromObj\fR
-will return \fBTCL_OK\fR is strictly larger than
-the set of values for which \fBTcl_GetBoolean\fR will do the same.
-For example, the value
-.QW 5
-passed to \fBTcl_GetBooleanFromObj\fR
-will lead to a \fBTCL_OK\fR return (and the boolean value 1),
-while the same value passed to \fBTcl_GetBoolean\fR will lead to
-a \fBTCL_ERROR\fR return.
-
-.SH "SEE ALSO"
-Tcl_NewObj, Tcl_IsShared, Tcl_GetBoolean
-
-.SH KEYWORDS
-boolean, value