delegate as memeber

[deadalnix]

Le 21/02/2012 17:30, Mantis a écrit :
> 21.02.2012 17:24, deadalnix пишет:
>> struct stuff {
>> private Exception delegate() exceptionBuilder = delegate Exception() {
>> return new Exception("foobar");
>> };
>> }
>>
>> The following piece of code trigger a compiler error : delegate
>> module.stuff.__dgliteral1 function literals cannot be class members
>>
>> Why is that ? Is it a bug or a feature ?
>>
>
> The compiler expects member initializers to be known at compile-time.
> Since delegate carries closure, and closure is a run-time phenomena, you
> cannot put it there. That's how I understand it, and I might be wrong.
> Anyway, something like this is possible as a workaround:
>
> struct Foo {
> private Exception dg() {
> if( m_Dg ) return m_Dg();
> return new Exception( "foobar" );
> }
>
> private Exception delegate() m_Dg = null;
> }

I think this the best solution after all.

But still I think the original code should be an error only if it use 
data out of the delegate scope. If it doesn't, frame pointer doesn't 
matter and null can be passed.