Re: [cmake-developers] $LIST_LENGTH{} syntax (was: Support for list length expression in if()-command?)
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
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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Re: [cmake-developers] $LIST_LENGTH{} syntax (was: Support for list length expression in if()-command?)
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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Re: [cmake-developers] $LIST_LENGTH{} syntax (was: Support for list length expression in if()-command?)
On 1/22/19 7:09 AM, tors...@robitzki.de wrote:
>> Am 22.01.2019 um 12:42 schrieb Brad King:
>> Rather than a special `if` syntax, perhaps we could introduce an
>> explicit `$LIST_LENGTH{mylist}` syntax. One would need to experiment
>> to see if modifying the variable expansion parser (under CMP0053 NEW
>> behavior only) to support this would have a significant performance
>> impact.
>
> What would be a good experiment setup?
Using `cmake -P test.cmake` to run a script that does a lot of
variable evaluations without the proposed syntax, and later with it.
> How about adding the ability to add such function? Like:
>
> procedure(LIST_LENGTH list)
> list(LENGTH list length)
> return(${length})
> endprocedure()
We don't have a syntax for invoking functions with return values.
That's a whole other discussion.
-Brad
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