man/man3/Tcl_ExprLong.3 - toolchains/skids - Git at Google

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 '\" RCS: @(#) $Id: ExprLong.3,v 1.6 2002/08/05 03:24:39 dgp Exp $
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 .TH Tcl_ExprLong 3 7.0 Tcl "Tcl Library Procedures"
 .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, string, longPtr\fR)
 .sp
 int
 \fBTcl_ExprDouble\fR(\fIinterp, string, doublePtr\fR)
 .sp
 int
 \fBTcl_ExprBoolean\fR(\fIinterp, string, booleanPtr\fR)
 .sp
 int
 \fBTcl_ExprString\fR(\fIinterp, string\fR)
 .SH ARGUMENTS
 .AS Tcl_Interp *booleanPtr
 .AP Tcl_Interp *interp in
 Interpreter in whose context to evaluate \fIstring\fR or \fIobjPtr\fR.
 .VS 8.4
 .AP "CONST char" *string in
 .VE
 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 \fIstring\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
 object-based procedures \fBTcl_ExprLongObj\fR, \fBTcl_ExprDoubleObj\fR,
 \fBTcl_ExprBooleanObj\fR, and \fBTcl_ExprObj\fR.
 Those object-based procedures evaluate an expression held in a Tcl object
 instead of a string.
 The object 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 ``yes'' or ``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.
 If the expression's actual value is an integer
 then \fBTcl_ExprString\fR converts it to a string using \fBsprintf\fR
 with a ``%d'' converter.
 If the expression's actual value is a floating-point
 number, then \fBTcl_ExprString\fR calls \fBTcl_PrintDouble\fR
 to convert it to a string.

 .SH "SEE ALSO"
 Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj

 .SH KEYWORDS
 boolean, double, evaluate, expression, integer, object, string
	'\"
	'\" 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.
	'\"
	'\" RCS: @(#) $Id: ExprLong.3,v 1.6 2002/08/05 03:24:39 dgp Exp $
	'\"
	'\" The definitions below are for supplemental macros used in Tcl/Tk
	'\" manual entries.
	'\"
	'\" .AP type name in/out ?indent?
	'\" Start paragraph describing an argument to a library procedure.
	'\" type is type of argument (int, etc.), in/out is either "in", "out",
	'\" or "in/out" to describe whether procedure reads or modifies arg,
	'\" and indent is equivalent to second arg of .IP (shouldn't ever be
	'\" needed; use .AS below instead)
	'\"
	'\" .AS ?type? ?name?
	'\" Give maximum sizes of arguments for setting tab stops. Type and
	'\" name are examples of largest possible arguments that will be passed
	'\" to .AP later. If args are omitted, default tab stops are used.
	'\"
	'\" .BS
	'\" Start box enclosure. From here until next .BE, everything will be
	'\" enclosed in one large box.
	'\"
	'\" .BE
	'\" End of box enclosure.
	'\"
	'\" .CS
	'\" Begin code excerpt.
	'\"
	'\" .CE
	'\" End code excerpt.
	'\"
	'\" .VS ?version? ?br?
	'\" Begin vertical sidebar, for use in marking newly-changed parts
	'\" of man pages. The first argument is ignored and used for recording
	'\" the version when the .VS was added, so that the sidebars can be
	'\" found and removed when they reach a certain age. If another argument
	'\" is present, then a line break is forced before starting the sidebar.
	'\"
	'\" .VE
	'\" End of vertical sidebar.
	'\"
	'\" .DS
	'\" Begin an indented unfilled display.
	'\"
	'\" .DE
	'\" End of indented unfilled display.
	'\"
	'\" .SO
	'\" Start of list of standard options for a Tk widget. The
	'\" options follow on successive lines, in four columns separated
	'\" by tabs.
	'\"
	'\" .SE
	'\" End of list of standard options for a Tk widget.
	'\"
	'\" .OP cmdName dbName dbClass
	'\" Start of description of a specific option. cmdName gives the
	'\" option's name as specified in the class command, dbName gives
	'\" the option's name in the option database, and dbClass gives
	'\" the option's class in the option database.
	'\"
	'\" .UL arg1 arg2
	'\" Print arg1 underlined, then print arg2 normally.
	'\"
	'\" RCS: @(#) $Id: man.macros,v 1.4 2000/08/25 06:18:32 ericm Exp $
	'\"
	'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
	.if t .wh -1.3i ^B
	.nr ^l \n(.l
	.ad b
	'\" # Start an argument description
	.de AP
	.ie !"\\$4"" .TP \\$4
	.el \{\
	. ie !"\\$2"" .TP \\n()Cu
	. el .TP 15
	.\}
	.ta \\n()Au \\n()Bu
	.ie !"\\$3"" \{\
	\&\\$1 \\fI\\$2\\fP (\\$3)
	.\".b
	.\}
	.el \{\
	.br
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	.nr )A 10n
	.if !"\\$1"" .nr )A \\w'\\$1'u+3n
	.nr )B \\n()Au+15n
	.\"
	.if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
	.nr )C \\n()Bu+\\w'(in/out)'u+2n
	..
	.AS Tcl_Interp Tcl_CreateInterp in/out
	'\" # BS - start boxed text
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	.el \{\
	.\" Draw four-sided box normally, but don't draw top of
	.\" box if the box started on an earlier page.
	.ie !\\n(^b-1 \{\
	\h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
	.el \}\
	\h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'\|0u-1.5n\(ul'
	.\}
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	.br
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	.sp -1
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	'\" # box/sidebar if in box/sidebar mode, then invoked standard
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	.\" draw two sides but no top otherwise.
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	.el \h'-1.5n'\L'\|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.\}
	.if \\n(^v \{\
	.nr ^x \\n(^tu+1v-\\n(^Yu
	\kx\h'-\\nxu'\h'\|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'\|0u'\c
	.\}
	.bp
	'fi
	.ev
	.if \\n(^b \{\
	.mk ^y
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	.\}
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	..
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	.de SO
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	.LP
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	..
	'\" # SE - end of list of standard options
	.de SE
	.fi
	.ft R
	.LP
	See the \\fBoptions\\fR manual entry for details on the standard options.
	..
	'\" # OP - start of full description for a single option
	.de OP
	.LP
	.nf
	.ta 4c
	Command-Line Name: \\fB\\$1\\fR
	Database Name: \\fB\\$2\\fR
	Database Class: \\fB\\$3\\fR
	.fi
	.IP
	..
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	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tcl_ExprLong 3 7.0 Tcl "Tcl Library Procedures"
	.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, string, longPtr\fR)
	.sp
	int
	\fBTcl_ExprDouble\fR(\fIinterp, string, doublePtr\fR)
	.sp
	int
	\fBTcl_ExprBoolean\fR(\fIinterp, string, booleanPtr\fR)
	.sp
	int
	\fBTcl_ExprString\fR(\fIinterp, string\fR)
	.SH ARGUMENTS
	.AS Tcl_Interp *booleanPtr
	.AP Tcl_Interp *interp in
	Interpreter in whose context to evaluate \fIstring\fR or \fIobjPtr\fR.
	.VS 8.4
	.AP "CONST char" *string in
	.VE
	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 \fIstring\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
	object-based procedures \fBTcl_ExprLongObj\fR, \fBTcl_ExprDoubleObj\fR,
	\fBTcl_ExprBooleanObj\fR, and \fBTcl_ExprObj\fR.
	Those object-based procedures evaluate an expression held in a Tcl object
	instead of a string.
	The object 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 ``yes'' or ``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.
	If the expression's actual value is an integer
	then \fBTcl_ExprString\fR converts it to a string using \fBsprintf\fR
	with a ``%d'' converter.
	If the expression's actual value is a floating-point
	number, then \fBTcl_ExprString\fR calls \fBTcl_PrintDouble\fR
	to convert it to a string.

	.SH "SEE ALSO"
	Tcl_ExprLongObj, Tcl_ExprDoubleObj, Tcl_ExprBooleanObj, Tcl_ExprObj

	.SH KEYWORDS
	boolean, double, evaluate, expression, integer, object, string