parameterized lazy expression

[freeagle]

BCS wrote:
> Reply to freeagle,
> 
>> Hello,
>>
>> is it possible somehow, to pass as a lazy argument expression with
>> argument/s?
>>
>> something like
>> foo((int x) x == 0);
>> where x will be passed as parameter to the exp inside the foo
>> function:
>>
>> void foo(lazy bool dg)
>> {
>> if(dg(10)) {...}
>> }
>> i'd like not to have to use foo(bool delegate(int x) {return x == 0})
>> if possible
>>
>> I hope i made myself clear, thanks for advices in advance :)
>>
>> freeagle
>>
> 
> the best you can do would be use the short form of delegates
> 
> foo((int x) {return x == 0;})
> 
> it's 3 char's longer than what you asked for but.
> 
> 
> OTOH could the syntax be changed so that a delegate uses a statement 
> rather than a block?
> 
> foo(bool delegate(int) a, int b);
> 
> foo((int x) return x == 0;, 5)
> 
> 


hmm, well, if thats the shortest possible form...

i wanted to make a template representing mathematical sets, that would 
be defined something like MSet!(int)(x > 0 && x < 10, x*2)
but with the returns and all, it looks weird:
MSet!(int)((int x) {return x > 0 && x < 10; }, (int x) { return x * 2; })

freeagle