src/mann/variable.n

   1 '\"
   2 '\" Copyright (c) 1993-1997 Bell Labs Innovations for Lucent Technologies
   3 '\" Copyright (c) 1997 Sun Microsystems, Inc.
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   6 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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   8 '\" RCS: @(#) $Id: variable.n,v 1.2 2003/11/24 05:10:00 bbbush Exp $
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  10 '\" The definitions below are for supplemental macros used in Tcl/Tk
  11 '\" manual entries.
  12 '\"
  13 '\" .AP type name in/out ?indent?
  14 '\"     Start paragraph describing an argument to a library procedure.
  15 '\"     type is type of argument (int, etc.), in/out is either "in", "out",
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  61 '\"
  62 '\" .OP cmdName dbName dbClass
  63 '\"     Start of description of a specific option.  cmdName gives the
  64 '\"     option's name as specified in the class command, dbName gives
  65 '\"     the option's name in the option database, and dbClass gives
  66 '\"     the option's class in the option database.
  67 '\"
  68 '\" .UL arg1 arg2
  69 '\"     Print arg1 underlined, then print arg2 normally.
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  71 '\" RCS: @(#) $Id: variable.n,v 1.2 2003/11/24 05:10:00 bbbush Exp $
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  73 '\"     # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
  74 .if t .wh -1.3i ^B
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  79 .ie !"\\$4"" .TP \\$4
  80 .el \{\
  81 .   ie !"\\$2"" .TP \\n()Cu
  82 .   el          .TP 15
  83 .\}
  84 .ta \\n()Au \\n()Bu
  85 .ie !"\\$3"" \{\
  86 \&\\$1  \\fI\\$2\\fP    (\\$3)
  87 .\".b
  88 .\}
  89 .el \{\
  90 .br
  91 .ie !"\\$2"" \{\
  92 \&\\$1  \\fI\\$2\\fP
  93 .\}
  94 .el \{\
  95 \&\\fI\\$1\\fP
  96 .\}
  97 .\}
  98 ..
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 102 .if !"\\$1"" .nr )A \\w'\\$1'u+3n
 103 .nr )B \\n()Au+15n
 104 .\"
 105 .if !"\\$2"" .nr )B \\w'\\$2'u+\\n()Au+3n
 106 .nr )C \\n()Bu+\\w'(in/out)'u+2n
 107 ..
 108 .AS Tcl_Interp Tcl_CreateInterp in/out
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 132 .\}
 133 .el \}\
 134 \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
 135 .\}
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 177 .el \h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\h'|0u'\c
 178 .\}
 179 .if \\n(^v \{\
 180 .nr ^x \\n(^tu+1v-\\n(^Yu
 181 \kx\h'-\\nxu'\h'|\\n(^lu+3n'\ky\L'-\\n(^xu'\v'\\n(^xu'\h'|0u'\c
 182 .\}
 183 .bp
 184 'fi
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 186 .if \\n(^b \{\
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 191 .mk ^Y
 192 .\}
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 201 .de DE
 202 .fi
 203 .RE
 204 .sp
 205 ..
 206 '\"     # SO - start of list of standard options
 207 .de SO
 208 .SH "STANDARD OPTIONS"
 209 .LP
 210 .nf
 211 .ta 5.5c 11c
 212 .ft B
 213 ..
 214 '\"     # SE - end of list of standard options
 215 .de SE
 216 .fi
 217 .ft R
 218 .LP
 219 See the \\fBoptions\\fR manual entry for details on the standard options.
 220 ..
 221 '\"     # OP - start of full description for a single option
 222 .de OP
 223 .LP
 224 .nf
 225 .ta 4c
 226 Command-Line Name:      \\fB\\$1\\fR
 227 Database Name:  \\fB\\$2\\fR
 228 Database Class: \\fB\\$3\\fR
 229 .fi
 230 .IP
 231 ..
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 233 .de CS
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 236 .ta .25i .5i .75i 1i
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 239 .de CE
 240 .fi
 241 .RE
 242 ..
 243 .de UL
 244 \\$1\l'|0\(ul'\\$2
 245 ..
 246 .TH variable n 8.0 Tcl "Tcl Built-In Commands"
 247 .BS
 248 '\" Note:  do not modify the .SH NAME line immediately below!
 249 .SH NAME
 250 variable \- 建立并初始化一个名字空间变量
 251 .SH "总览 SYNOPSIS"
 252 \fBvariable \fR?\fIname value...\fR? \fIname \fR?\fIvalue\fR?
 253 .BE
 254
 255 .SH "描述 DESCRIPTION"
 256 .PP
 257 通常在 \fBnamespace eval\fR 命令中使用这个命令在一个名字空间中建立一个或多个变量。每个变量 \fIname\fR 都被初始化为 \fIvalue\fR。给最后一个变量的值是可选的。
 258 .PP
 259 如果一个变量 \fIname\fR 不存在，则建立它。在这种情况下，如果指定了 \fIvalue\fR ，它被分配为一个新建的变量。如果未指定 \fIvalue\fR，则保持新变量为未定义。如果变量已经存在，若指定了 \fIvalue\fR 则把它设置为 \fIvalue\fR ，若未给出 \fIvalue\fR 则保持不变。通常的，\fIname\fR 是未被限定的(不包含任何包容它的名字空间的名字)，而变量建立在当前名字空间中。如果 \fIname\fR 包含任何名字空间限定符，则变量建立在指定的名字空间中。如果变量未被定义，它将对 \fBnamespace which\fR 命令是可见的，但对 \fBinfo exists\fR 命令不是。
 260 .PP
 261 如果在一个 Tcl 过程中执行 \fBvariable\fR 命令，它建立连接到相应的名字空间变量的局部变量。在这种方式下 \fBvariable\fR 命令类似于 \fBglobal\fR 命令，但 \fBglobal\fR 命令只连接到在全局名字空间中的变量。如果给出了任何 \fIvalue\fR，使用它们来修改相关的名字空间变量的值。如果一个名字空间变量不存在，则建立它并可选择的初始化它。
 262 .PP
 263 \fIname\fR 参数不能引用在数组中的一个元素。\fIname\fR 应该引用整个数组，并应当去掉初始化的 \fIvalue\fR 。在变量被声明之后，可以使用平常的 \fBset\fR 或 \fBarray\fR 命令来设置数组中的元素。
 264
 265 .SH "参见 SEE ALSO"
 266 global(n), namespace(n), upvar(n)
 267
 268 .SH "关键字 KEYWORDS"
 269 global, namespace, procedure, variable
 270
 271 .SH "[中文版维护人]"
 272 .B 寒蝉退士
 273 .SH "[中文版最新更新]"
 274 .B 2001/11/20
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 276 .BI http://cmpp.linuxforum.net