Swizzling

private float[DIMENSION] coords = [0.0f, 0.0f, 0.0f, 1.0f];

@property pure auto opDispatch(const string swizzling)() const
if (swizzling.length == DIMENSION || swizzling.length == DIMENSION - 1)
{
    immutable expression = "coords".repeat().take(swizzling.length)
        .zip(swizzling).map!( a => format("%s[%c]", a[0], a[1].toUpper()) ).reduce!((a,b) => a ~ "," ~ b);

    mixin( "return Vector4 (" ~ expression ~ ");" );
}