[Feature Request] Forwardable as Ruby does

[kennytm]

bioinfornatics <bioinfornatics at fedoraproject.org> wrote:
> Le lundi 05 mars 2012 ‡ 17:55 +0000, kennytm a Ècrit :
>> bioinfornatics <bioinfornatics at fedoraproject.org> wrote:
>>> dear,
>>> I would like a easy way to forward as does ruby:
>>> http://www.ruby-doc.org/stdlib-1.9.3/libdoc/forwardable/rdoc/Forwardable.html
>>> 
>>> I have already something close: 
>>> - https://gist.github.com/1969776 (me)
>>> - http://paste.pocoo.org/show/uoD89CCjX5H3m6GvPvW6/ (dav1d)
>>> 
>>> But it works only for array.
>>> 
>>> 
>>> I have try to do this purpose: https://gist.github.com/1974033
>>> 
>>> but i am too new in D
>>> 
>>> This feature will be really awesome and could be go into std.traits
>> 
>> Check 'opDispatch' and 'alias this'.
> 
> alias this is not the answer as it forward all, i fyo want select for
> this member forwad this method and for another this one  ...
> 
> opDispaytch is not really easy to use for this. my first code do this in
> 1 line and it is easy to understand hat it do. In 1 line i forward 3
> method to a member. This save time, code and bug.

You can just mixin an opDispatch function, like (not tested, only works for
functions)

    mixin template Forward(alias member, s...) {
        auto opDispatch(string name, T...)(T args) {
            static assert(canFind(s, name));
            return mixin("member." ~ name ~ "(args)");
        }
    }

or use a foreach over 's' and mixin the function/member definitions for
each name.