Peder Holt <peder.holt@gmail.com> writes:
What remains then is to decide which of the two template registration schemes should be used: REGISTER_TEMPLATE(type,2,(typename,int)) or REGISTER_TEMPLATE(type,(typename)(int))
I generally dislike interfaces that require counting, so prefer #2. However, in MPL's new assertions we were able to avoid the big problems with parenthesization and commas in the PP by actually using a parenthesized macro argument to form the argument list of a function type, so in: BOOST_MPL_ASSERT((is_same<std::pair<int,int>, B>)) a function type is formed, something like: int (*)(is_same<std::pair<int,int>, B>) I don't know whether that's possible in this case, but if so it's a significant usability win. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com