Hi,

2013/6/22 Bruno Lalande <bruno.lalande@gmail.com>

Ok, the Vector Concept looks obvious as it would be probably exactly the same as Point.

Yep, as I said one question is: should vector_type<point> just return point by default, and users interested in vector/point differentiation would have to state it by specializing the metafunction (or calling a convenience macro)? or should it enforce point/vector differentiation straight away? Personally, for backward compatibility and "simplicity by default" reasons, I'd vote for the former.

But why do we need vector_type at all? If we had Vector concept it should just work with algorithms. And difference() could work for Points and Vectors. The user could call

Point p = return_difference<Point>(p1, p2);

or if he want to use some legacy vector class he could adapt it to the Vector concept and use it:

MyVector v = return_difference<MyVector>(p1, p2);

just like in the case of Geometries.

Regards,

Adam