[Issue 9065] Please consider adding these std.traits

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9065



--- Comment #41 from Manu <turkeyman at gmail.com> 2012-11-27 09:26:36 PST ---
(In reply to comment #37)
> This is a compiler bug, not an issue of isFunction template.
> I filed new bug 9083.

I found another one, probably a compiler bug too, but I'll paste it here since
it depends on your new isVariable trait:

Boiled down as much as I could...

class Test
{
    void func()
    {
        void templateFunc( T )( ref const T obj )
        {
            foreach( m; __traits( allMembers, T ) )
            {
                pragma(msg, m);
                static if( isVariable!( __traits(getMember, T, m) ) )
                {
                    //...
                }
            }
        }

        templateFunc( this );
    }

    // some class members
    int x;
}

isVariable throws lots of errors when considering the class members.

Note:
  __traits(allMembers, T) and __traits(getMember, T, m)

These should also work with class instances, not just types, eg:
  __traits(allMembers, obj) and __traits(getMember, obj, m)

And these combinations should also work:
  __traits(allMembers, T) and __traits(getMember, obj, m)
  __traits(allMembers, obj) and __traits(getMember, T, m)

All these configurations throw errors, and the errors are different for each
configuration.

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