Cannot use function as foreach aggregate.

[Jarrett Billingsley]

"BCS" <BCS at pathlink.com> wrote in message 
news:ev0i44$2io$5 at digitalmars.com...
> Jarrett Billingsley wrote:
>
> I can't help but wonder if this works.
>
> template ToDelegate(RetType, RetType function(Args) func, Args...)
> {
>     struct S
>     {
>         static S s
>         RetType callMe(Args args)
>         {
>             return func(args);
>         }
>     }
>     alias &S.s.callMe ToDelegate;
> }

Not quite.. you can't alias addresses, and I don't think you can pass 
function pointers as template arguments (though I might be wrong).

Though using your idea of a single static instance of the struct, my 
function can then become:

RetType delegate(Args) ToDelegate(RetType, Args...)(RetType function(Args) 
func)
{
    struct S
    {
        static S s;
        static RetType function(Args) func;

        RetType callMe(Args args)
        {
            return func(args);
        }
    }

    S.func = func;
    return &S.s.callMe;
}

Which is pretty sweet, as it no longer requires a heap allocation with each 
call.