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-'\"
-'\" Copyright (c) 1989-1993 The Regents of the University of California.
-'\" Copyright (c) 1994-1997 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_ExprLong 3 7.0 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_ExprLong, Tcl_ExprDouble, Tcl_ExprBoolean, Tcl_ExprString \- evaluate an expression
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-int
-\fBTcl_ExprLong\fR(\fIinterp, expr, longPtr\fR)
-.sp
-int
-\fBTcl_ExprDouble\fR(\fIinterp, expr, doublePtr\fR)
-.sp
-int
-\fBTcl_ExprBoolean\fR(\fIinterp, expr, booleanPtr\fR)
-.sp
-int
-\fBTcl_ExprString\fR(\fIinterp, expr\fR)
-.SH ARGUMENTS
-.AS Tcl_Interp *booleanPtr out
-.AP Tcl_Interp *interp in
-Interpreter in whose context to evaluate \fIexpr\fR.
-.AP "const char" *expr in
-Expression to be evaluated.
-.AP long *longPtr out
-Pointer to location in which to store the integer value of the
-expression.
-.AP int *doublePtr out
-Pointer to location in which to store the floating-point value of the
-expression.
-.AP int *booleanPtr out
-Pointer to location in which to store the 0/1 boolean value of the
-expression.
-.BE
-
-.SH DESCRIPTION
-.PP
-These four procedures all evaluate the expression
-given by the \fIexpr\fR argument
-and return the result in one of four different forms.
-The expression can have any of the forms accepted by the \fBexpr\fR command.
-Note that these procedures have been largely replaced by the
-value-based procedures \fBTcl_ExprLongObj\fR, \fBTcl_ExprDoubleObj\fR,
-\fBTcl_ExprBooleanObj\fR, and \fBTcl_ExprObj\fR.
-Those value-based procedures evaluate an expression held in a Tcl value
-instead of a string.
-The value argument can retain an internal representation
-that is more efficient to execute.
-.PP
-The \fIinterp\fR argument refers to an interpreter used to
-evaluate the expression (e.g. for variables and nested Tcl
-commands) and to return error information.
-.PP
-For all of these procedures the return value is a standard
-Tcl result: \fBTCL_OK\fR means the expression was successfully
-evaluated, and \fBTCL_ERROR\fR means that an error occurred while
-evaluating the expression.
-If \fBTCL_ERROR\fR is returned then
-the interpreter's result will hold a message describing the error.
-If an error occurs while executing a Tcl command embedded in
-the expression then that error will be returned.
-.PP
-If the expression is successfully evaluated, then its value is
-returned in one of four forms, depending on which procedure
-is invoked.
-\fBTcl_ExprLong\fR stores an integer value at \fI*longPtr\fR.
-If the expression's actual value is a floating-point number,
-then it is truncated to an integer.
-If the expression's actual value is a non-numeric string then
-an error is returned.
-.PP
-\fBTcl_ExprDouble\fR stores a floating-point value at \fI*doublePtr\fR.
-If the expression's actual value is an integer, it is converted to
-floating-point.
-If the expression's actual value is a non-numeric string then
-an error is returned.
-.PP
-\fBTcl_ExprBoolean\fR stores a 0/1 integer value at \fI*booleanPtr\fR.
-If the expression's actual value is an integer or floating-point
-number, then they store 0 at \fI*booleanPtr\fR if
-the value was zero and 1 otherwise.
-If the expression's actual value is a non-numeric string then
-it must be one of the values accepted by \fBTcl_GetBoolean\fR
-such as
-.QW yes
-or
-.QW no ,
-or else an error occurs.
-.PP
-\fBTcl_ExprString\fR returns the value of the expression as a
-string stored in the interpreter's result.
-
-.SH "SEE ALSO"
-Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj
-
-.SH KEYWORDS
-boolean, double, evaluate, expression, integer, value, string