CODEWITHSUNDEEP
variablesnamespacestclproc
sawyermclane
sawyermclane

Reputation: 1066

Pass variable between procs in the same namespace

I have two procs in the same namespace

proc myNamespace::function {} {
  set myVar "Hello"
}

proc myNamespace::otherFunction {} {
  global myVar
  puts $myVar
}

Now for some reason this does not work. I have tried using upvar #0 to make myVar a global variable. I have tried doing global myNamespace::myVar in otherFunction, nothing seems to work. I just want to be able to have myVar be a variable in the myNamespace namespace. How can I accomplish this?

Upvotes: 0

Views: 207

Answers (1)

Peter Lewerin
Peter Lewerin

Reputation: 13252

Try

proc myNamespace::function {} {
    variable myVar
    set myVar "Hello"
}

proc myNamespace::otherFunction {} {
    variable myVar
    puts $myVar
}

Variables created within a command are always local variables unless they are expressly declared to be namespace variables (with the variable command) or global variables (with the global command). Tcl doesn't use lexical scoping, so a command never just picks up variables from the surrounding scope. It is also possible to use namespace or global variables without declarations if one uses namespace-qualified names such as ::foo::bar (the namespace variable bar in the foo namespace which is a child of the :: namespace) or ::baz (the global variable baz).

Documentation: global, proc, set, variable

Upvotes: 3

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