Re: [Boost-users] [GIL] Why does 'get_color' take a tag object instead of its type only?

Uh... maybe I didn't express clearly. It's currently defined as:

template get_color(ColorBase& cb, Color=Color())

I just want to know why not just take Color by the type, e.g.

template get_color(ColorBase& cb)

Sorry, I cannot comment on the this design decision. In case it really annoys you. You could just: template< typename Color, typename Color_Base > typename color_element_reference_type::type foo( Color_Base& p ) { return get_color( p, Color() ); } template< typename Color, typename Color_Base > typename color_element_const_reference_type::type foo( const Color_Base& p ) { return get_color( p, Color() ); } int main() { unsigned char ff = foo( p ); return 0; } Hope this helps.

I'm trying the non-intrusive (adapted) approach to make it a Fusion Sequence, I'll back to here when done.

Code above could be rewritten as: fusion::at_key(a) == fusion::at_key(b)

Was Fusion around when gil was introduced? Christian