[cmake-developers] $LIST_LENGTH{} syntax (was: Support for list length expression in if()-command?)

[Robert Maynard]

I like some syntax that looks like $LEN{}.

I would love to keep the $...{ syntax open for future exentsion such
as easy target property set/get ( $[prop_name]{target} ) . This seems
to be okay as $ENV, and $CACHE only work on variables, so therefore
adding $LEN that also only works on variables seems reasonable.

On Tue, Jan 22, 2019 at 7:46 AM Brad King via cmake-developers
<cmake-developers at cmake.org> wrote:
>
> On 1/22/19 7:40 AM, Daniel Franke wrote:
> > Whats about a Syntax like
> >
> > ${list::LENGTH}
>
> That would require dispatch after matching `${VAR}` syntax, and
> that lookup is one of the hottest paths according to profiling.
> We already have $ENV{} and $CACHE{} syntax.
>
> -Brad
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