On Thursday 05 February 2015 15:14:04 Dmitry Stogov wrote:
>
> function foo()
> requre(<input-assert-expression>)
> ensure(<output-assert-expression>)
> {
> ...
> }
>
> It would require only one new reserved word "ensure".
Regarding syntax.... This could be another place where the irrationally-
dreaded declare would make sense:
function foo() {
declare(pre) {
if (whatever...) return false;
// arbitrary PHP code
}
declare(post=$resultvar) {
if ($resultvar == XXX) return true;
return false;
}
}
This way, no new reserved words are needed at all, and the programmer can give
a name to the "variable that holds the result" locally to avoid clashes with
anything else in the function.
I'm a bit undecided whether returning true/false there to give the verdict,
would be the best way. Maybe better would be another use for declare, without
a block, to declare that the pre/postcondition failed - giving a nice place to
put a suitable message, too. And again without introducing any extra keywords:
function foo() {
declare(post=$resultvar) {
if ($resultvar == XXX) declare(fail="My $resultvar looks fishy");
}
}
best regards
Patrick
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