about tons of user types No, I was speaking of matrix of user defined nuemrical types ;) But the discussion on shape is good [snip]
resume: in my opinion this all is convinient, delivers clarity of user code, easy to understand and implement, easy to customize and extend
what do you think about it Yet again, use policy. It'll clutter the code to have 34567 names for different object while having the shape as a template policy is
DE wrote: prolly better. ANd the enforcement of shape semantic has to be implicit and static, no need for need_simmetric. matrix<float, settings(diagonal)> m; For checking arguments of elements with same shape, just use tag dispatching or SFINAE instead of concrete typing. -- ___________________________________________ Joel Falcou - Assistant Professor PARALL Team - LRI - Universite Paris Sud XI Tel : (+33)1 69 15 66 35