Tcl - Re: Why doesn't foreach return a value

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Re: Why doesn't foreach return a value

Mark Janssen

2008-01-30, 7:46 pm

On Jan 30, 7:57 pm, "tom.rmadilo" <tom.rmad...@gmail.com> wrote:
> On Jan 30, 10:40 am, Mark Janssen <mpc.jans...@gmail.com> wrote:
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> One other observation is that there is a confusion here between the
> logical meaning and technical details like the internal implementation
> or the ability of Tcl to introspect this internal stuff:
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> proc my_proc { vars } {
> foreach var $vars {
> upvar $var $var
> }
> ...
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> }
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> If the foreach callframe were a logical callframe/level, you couldn't
> do the above. Many things would become difficult to understand, or
> even impossible to do, and would depend upon knowledge of internal
> details of a procedure.

The foreach frame *is* a logical level. Just one you cannot get at
from the body as that is upleveled.

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