From: Simon Buchan <simon@hand-multimedia.co.nz>
Robert Kawulak wrote:
In bounded policies I use passed_value_type initialize() where passed_value_type is value_type for integral types and const value_type & for other types. The second returns a reference to a static object - that's the most efficient method I can think of, initialization takes only one copy-construction (for details please look into the code).
ref to static? It feels cludgy. Just trust the RVO even for user classes, IMHO, it's how the std lib works. Unfortunately the RVO can't get rid of the side-effects of c/d'tors, so you should make sure it's documented that values must have normal copy semantics if default initialisation is used.
I agree. Returning a reference to a function local static is kludgy.
What you are suggesting is equivalent to suggesting that std::vector should be named "vector_type" because it is a class template.
Uhh, maybe you're right ;-) I don't know why, but it just "byte my eyes" when I see a type named "something_value"... Nevermind, if people here really resist that it should be called constrained_value instead of constrained_type, then OK - I'll change it.
Why not just 'constrained'? ie. constrained<int>?
That works for me. -- Rob Stewart stewart@sig.com Software Engineer http://www.sig.com Susquehanna International Group, LLP using std::disclaimer;