Re: Let this() figure out T implicitly?

[Steven Schveighoffer]

On Fri, 17 Feb 2012 07:19:28 -0500, kraybourne <st...@kraybourne.com>  
wrote:

Hi!
This doesn't work:

        import std.stdio;
        class Foo(T)
        {
                T t;
                this(T val)
                {
                        t = val;
                }
        }

        void main()
        {
                auto o = new Foo(5);
        }
        _____

        $ dmd foo
        foo.d(13): Error: class foo.Foo(T) is used as a type
        $ _

So I must

        auto o = new Foo!(int)(5);

Then it compiles. Is it possible to have this() figure out the type some  
way? (In this particular example it's perhaps not such a big deal. But  
imagine a lot more args.)

What you are asking for is IFTI (Implicit Function Template Instantiation)  
on constructors, and is perfectly possible, but not implemented:

http://d.puremagic.com/issues/show_bug.cgi?id=6082

Vote up if you want to see it happen!

-Steve