delegate as memeber

[Ali Çehreli]

On 02/21/2012 07:43 AM, deadalnix wrote:
 > Le 21/02/2012 16:32, Vladimir Panteleev a écrit :
 >> On Tuesday, 21 February 2012 at 15:22:15 UTC, deadalnix wrote:
 >>> 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 ?
 >>
 >> Delegates contain a context pointer. Your delegate literal has no
 >> context.
 >>
 >> You can't initialize it with the address of a method, either. For struct
 >> methods, the context pointer is a pointer to the structure. You can't
 >> have a .init that contains a pointer to an instance. You probably want
 >> to use a function literal.
 >
 > It doesn't work with function either.
 >
 > But I need delegate here. The default one doesn't require a context, but
 > isn't it possible to pass null as a context, as none is needed ? This
 > value can be changer later, and definitively require to be a delegate.

Could std.functional.toDelegate be helpful here?

   http://dlang.org/phobos/std_functional.html#toDelegate

Ali