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

 '\"
 '\" Copyright (c) 1994 The Regents of the University of California.
 '\" Copyright (c) 1994-1996 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: UpVar.3,v 1.7 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.
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 '\"	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
 .ie !"\\$2"" \{\
 \&\\$1	\\fI\\$2\\fP
 .\}
 .el \{\
 \&\\fI\\$1\\fP
 .\}
 .\}
 ..
 '\"	# define tabbing values for .AP
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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
 '\"	# ^y = starting y location
 '\"	# ^b = 1
 .de BS
 .br
 .mk ^y
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 .if n .fi
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 .ie n \l'\\n(^lu\(ul'
 .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'
 .\}
 .\}
 .fi
 .br
 .nr ^b 0
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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
 .\}
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 .SH "STANDARD OPTIONS"
 .LP
 .nf
 .ta 5.5c 11c
 .ft B
 ..
 '\"	# 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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 .de UL
 \\$1\l'|0\(ul'\\$2
 ..
 .TH Tcl_UpVar 3 7.4 Tcl "Tcl Library Procedures"
 .BS
 .SH NAME
 Tcl_UpVar, Tcl_UpVar2 \- link one variable to another
 .SH SYNOPSIS
 .nf
 \fB#include <tcl.h>\fR
 .sp
 int
 \fBTcl_UpVar(\fIinterp, frameName, sourceName, destName, flags\fB)\fR
 .sp
 int
 \fBTcl_UpVar2(\fIinterp, frameName, name1, name2, destName, flags\fB)\fR
 .SH ARGUMENTS
 .AS Tcl_VarTraceProc prevClientData
 .AP Tcl_Interp *interp in
 Interpreter containing variables;  also used for error reporting.
 .AP "CONST char" *frameName in
 Identifies the stack frame containing source variable.
 May have any of the forms accepted by
 the \fBupvar\fR command, such as \fB#0\fR or \fB1\fR.
 .AP "CONST char" *sourceName in
 Name of source variable, in the frame given by \fIframeName\fR.
 May refer to a scalar variable or to an array variable with a
 parenthesized index.
 .AP "CONST char" *destName in
 Name of destination variable, which is to be linked to source
 variable so that references to \fIdestName\fR
 refer to the other variable.  Must not currently exist except as
 an upvar-ed variable.
 .AP int flags in
 Either TCL_GLOBAL_ONLY or 0;  if non-zero, then \fIdestName\fR is
 a global variable;  otherwise it is a local to the current procedure
 (or global if no procedure is active).
 .AP "CONST char" *name1 in
 First part of source variable's name (scalar name, or name of array
 without array index).
 .AP "CONST char" *name2 in
 If source variable is an element of an array, gives the index of the element.
 For scalar source variables, is NULL.
 .BE

 .SH DESCRIPTION
 .PP
 \fBTcl_UpVar\fR and \fBTcl_UpVar2\fR provide the same functionality
 as the \fBupvar\fR command:  they make a link from a source variable
 to a destination variable, so that references to the destination are
 passed transparently through to the source.
 The name of the source variable may be specified either as a single
 string such as \fBxyx\fR or \fBa(24)\fR (by calling \fBTcl_UpVar\fR)
 or in two parts where the array name has been separated from the
 element name (by calling \fBTcl_UpVar2\fR).
 The destination variable name is specified in a single string;  it
 may not be an array element.
 .PP
 Both procedures return either TCL_OK or TCL_ERROR, and they
 leave an error message in the interpreter's result if an error occurs.
 .PP
 As with the \fBupvar\fR command, the source variable need not exist;
 if it does exist, unsetting it later does not destroy the link.  The
 destination variable may exist at the time of the call, but if so
 it must exist as a linked variable.

 .SH KEYWORDS
 linked variable, upvar, variable
	'\"
	'\" Copyright (c) 1994 The Regents of the University of California.
	'\" Copyright (c) 1994-1996 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: UpVar.3,v 1.7 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
	.ie !"\\$2"" \{\
	\&\\$1 \\fI\\$2\\fP
	.\}
	.el \{\
	\&\\fI\\$1\\fP
	.\}
	.\}
	..
	'\" # define tabbing values for .AP
	.de AS
	.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
	'\" # ^y = starting y location
	'\" # ^b = 1
	.de BS
	.br
	.mk ^y
	.nr ^b 1u
	.if n .nf
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	.if n \l'\\n(.lu\(ul'
	.if n .fi
	..
	'\" # BE - end boxed text (draw box now)
	.de BE
	.nf
	.ti 0
	.mk ^t
	.ie n \l'\\n(^lu\(ul'
	.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'
	.\}
	.\}
	.fi
	.br
	.nr ^b 0
	..
	'\" # VS - start vertical sidebar
	'\" # ^Y = starting y location
	'\" # ^v = 1 (for troff; for nroff this doesn't matter)
	.de VS
	.if !"\\$2"" .br
	.mk ^Y
	.ie n 'mc \s12\(br\s0
	.el .nr ^v 1u
	..
	'\" # VE - end of vertical sidebar
	.de VE
	.ie n 'mc
	.el \{\
	.ev 2
	.nf
	.ti 0
	.mk ^t
	\h'\|\\n(^lu+3n'\L'\|\\n(^Yu-1v\(bv'\v'\\n(^tu+1v-\\n(^Yu'\h'-\|\\n(^lu+3n'
	.sp -1
	.fi
	.ev
	.\}
	.nr ^v 0
	..
	'\" # Special macro to handle page bottom: finish off current
	'\" # box/sidebar if in box/sidebar mode, then invoked standard
	'\" # page bottom macro.
	.de ^B
	.ev 2
	'ti 0
	'nf
	.mk ^t
	.if \\n(^b \{\
	.\" Draw three-sided box if this is the box's first page,
	.\" draw two sides but no top otherwise.
	.ie !\\n(^b-1 \h'-1.5n'\L'\|\\n(^yu-1v'\l'\\n(^lu+3n\(ul'\L'\\n(^tu+1v-\\n(^yu'\h'\|0u'\c
	.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
	.nr ^b 2
	.\}
	.if \\n(^v \{\
	.mk ^Y
	.\}
	..
	'\" # DS - begin display
	.de DS
	.RS
	.nf
	.sp
	..
	'\" # DE - end display
	.de DE
	.fi
	.RE
	.sp
	..
	'\" # SO - start of list of standard options
	.de SO
	.SH "STANDARD OPTIONS"
	.LP
	.nf
	.ta 5.5c 11c
	.ft B
	..
	'\" # 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
	..
	'\" # CS - begin code excerpt
	.de CS
	.RS
	.nf
	.ta .25i .5i .75i 1i
	..
	'\" # CE - end code excerpt
	.de CE
	.fi
	.RE
	..
	.de UL
	\\$1\l'\|0\(ul'\\$2
	..
	.TH Tcl_UpVar 3 7.4 Tcl "Tcl Library Procedures"
	.BS
	.SH NAME
	Tcl_UpVar, Tcl_UpVar2 \- link one variable to another
	.SH SYNOPSIS
	.nf
	\fB#include <tcl.h>\fR
	.sp
	int
	\fBTcl_UpVar(\fIinterp, frameName, sourceName, destName, flags\fB)\fR
	.sp
	int
	\fBTcl_UpVar2(\fIinterp, frameName, name1, name2, destName, flags\fB)\fR
	.SH ARGUMENTS
	.AS Tcl_VarTraceProc prevClientData
	.AP Tcl_Interp *interp in
	Interpreter containing variables; also used for error reporting.
	.AP "CONST char" *frameName in
	Identifies the stack frame containing source variable.
	May have any of the forms accepted by
	the \fBupvar\fR command, such as \fB#0\fR or \fB1\fR.
	.AP "CONST char" *sourceName in
	Name of source variable, in the frame given by \fIframeName\fR.
	May refer to a scalar variable or to an array variable with a
	parenthesized index.
	.AP "CONST char" *destName in
	Name of destination variable, which is to be linked to source
	variable so that references to \fIdestName\fR
	refer to the other variable. Must not currently exist except as
	an upvar-ed variable.
	.AP int flags in
	Either TCL_GLOBAL_ONLY or 0; if non-zero, then \fIdestName\fR is
	a global variable; otherwise it is a local to the current procedure
	(or global if no procedure is active).
	.AP "CONST char" *name1 in
	First part of source variable's name (scalar name, or name of array
	without array index).
	.AP "CONST char" *name2 in
	If source variable is an element of an array, gives the index of the element.
	For scalar source variables, is NULL.
	.BE

	.SH DESCRIPTION
	.PP
	\fBTcl_UpVar\fR and \fBTcl_UpVar2\fR provide the same functionality
	as the \fBupvar\fR command: they make a link from a source variable
	to a destination variable, so that references to the destination are
	passed transparently through to the source.
	The name of the source variable may be specified either as a single
	string such as \fBxyx\fR or \fBa(24)\fR (by calling \fBTcl_UpVar\fR)
	or in two parts where the array name has been separated from the
	element name (by calling \fBTcl_UpVar2\fR).
	The destination variable name is specified in a single string; it
	may not be an array element.
	.PP
	Both procedures return either TCL_OK or TCL_ERROR, and they
	leave an error message in the interpreter's result if an error occurs.
	.PP
	As with the \fBupvar\fR command, the source variable need not exist;
	if it does exist, unsetting it later does not destroy the link. The
	destination variable may exist at the time of the call, but if so
	it must exist as a linked variable.

	.SH KEYWORDS
	linked variable, upvar, variable