Re: Cast Object - get null

Namespace Wed, 18 Apr 2012 10:39:17 -0700

I take your first example and the relevant class part looks nowlike this:

class Vector2D(T) {
public:
        T x;
        T y;


        this() { }

        /**
        *
        */
        static Vector2D!(T) opCall(U, V)(U x, V y) {
                Vector2D!(T) vec = new Vector2D!(T)();
                vec.x = cast(T) x;
                vec.y = cast(T) y;

                return vec;
        }
        
        /**
        *
        */
        static Vector2D!(T) opCall(U)(const Vector2D!(U) vec) {
                assert(vec !is null);

                return Vector2D!(T)(vec.x, vec.y);
        }
        
        U opCast(U)() const
                if (is(Unqual!U == Vector2D!byte) ||
                        is(Unqual!U == Vector2D!ubyte) ||
                        is(Unqual!U == Vector2D!short) ||
                        is(Unqual!U == Vector2D!ushort) ||
                        is(Unqual!U == Vector2D!int) ||
                        is(Unqual!U == Vector2D!uint) ||
                        is(Unqual!U == Vector2D!long) ||
                        is(Unqual!U == Vector2D!ulong) ||
                        is(Unqual!U == Vector2D!float) ||
                        is(Unqual!U == Vector2D!double) ||
                        is(Unqual!U == Vector2D!real))
        {
                U v = new U(this.x, this.y);
        }

As you see i have a static opCall.
But now i get this compiler errors:

cast.d(309): Error: template instance opCast!(Object)opCast!(Object) does not match template declaration opCast(U) if (is(Unqual!(U) ==Vector2D!(byte)) || is(Unqual!(U) == Vector2D!(ubyte)) || is(Unqual!(U) ==Vector2D!(short)) || is(Unqual!(U) == Vector2D!(ushort)) || is(Unqual!(U) == Vector2D!(int))|| is(Unqual!(U) == Vector2D!(uint)) || is(Unqual!(U) == Vector2D!(long)) ||is(Unqual!(U) == Vector2D!(ulong)) || is(Unqual!(U) == Vector2D!(float)) ||is(Unqual!(U) == Vecto

r2D!(double)) || is(Unqual!(U) == Vector2D!(real)))

cast.d(309): Error: function expected before (), notvs2.opCast!(Object) of type

 void

r2D!(double)) || is(Unqual!(U) == Vector2D!(real)))

cast.d(309): Error: function expected before (), notvf.opCast!(Object) of type

void

It seems that opCast and opEquals don't like each other.
Line 309 is
if (vs2 == vf) {

Re: Cast Object - get null

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