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NAME

       upvar -

 SYNOPSIS
       upvar ?level? otherVar myVar ?otherVar myVar ...?
_________________________________________________________________

 DESCRIPTION
         Level   uplevel   otherVar  # (1) otherVar upvar  level ( level  #0 )
       myVar  otherVar  myVar  upvar  myVar MyVar  a(b)OtherVar Upvar

       upvar (call-by-name) Tcl :
              proc add2 name {
                upvar $name x
                set x [expr $x+2]
              }
        Add2  add2  uplevel  upvar upvar  add2

       namespace eval  Tcl () namespace eval   uplevel   upvar  info  level  1
       namespace eval uplevel #0 ()

       (unset) upvar ( add2  x ) unset  upvar  upvar  upvar  upvar (retarget)  |

Traces  upvar                                                                  |
       upvar  trace  otherVar  myVar  myVar  otherVar   localVar  originalVar: |
              proc traceproc { name index op } {                               |
                puts $name                                                     |
              }                                                                |
              proc setByUpvar { name value } {                                 |
                upvar $name localVar                                           |
                set localVar $value                                            |
              }                                                                |
              set originalVar 1                                                |
              trace variable originalVar w traceproc                           |
              setByUpvar originalVar 2                                         |
              }                                                                |

        otherVar  myVar () env myVar                                           |

 SEE ALSO
       global(n), namespace(n), uplevel(n), variable(n)

 KEYWORDS
       context, frame, global, level, namespace, procedure, variable

[]

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       2001/11/21

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