SYNOPSIS
itcl::scope name
DESCRIPTION
Creates a scoped value for the specified name, which must be a variable name. If the name is an instance variable, then the scope command returns a string of the following form:
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@itcl object varName
If the name is not an instance variable, then it must be a common variable or a global variable. In that case, the scope command returns the fully qualified name of the variable, e.g., ::foo::bar::x.
If the name is not recognized as a variable, the scope command returns an error.
Ordinary variable names refer to variables in the global namespace. A scoped value captures a variable name together with its namespace context in a way that allows it to be referenced properly later. It is needed, for example, to wrap up variable names when a Tk widget is used within a namespace:
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namespace foo { private variable mode 1 radiobutton .rb1 -text "Mode #1" -variable [scope mode] -value 1 pack .rb1 radiobutton .rb2 -text "Mode #2" -variable [scope mode] -value 2 pack .rb2 }
You should never use the @itcl syntax directly. For example, it is a bad idea to write code like this:
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set {@itcl ::fred x} 3 puts "value = ${@itcl ::fred x}"
KEYWORDS
code, namespace, variable