Matt Calabrese wrote:
On 6/20/06, Nicolas Fleury <nidoizo@yahoo.com> wrote:
Is there something like a is_specialization in Boost.Traits?
From your example, I believe you mean "is instantation of" not "is specialization of". If so, I do agree that such a metafunction would be useful, as I find myself rolling my own similar metafunctions every once in a while. However, your example incorrectly assumes that char and int are different sizes ( sizeof(int) can yield 1 in a compliant C++ implementation ).
I totally agree. Yes, that's exactly what I mean.
(...) BOOST_GENERATE_IS_INSTANTIATION_OF ( is_boost_array, array, (typename)(::std::size_t) )
// Then use somewhere else bool const value = ::boost::is_boost_array< ::boost::array< int, 10 >
::value;
Sounds great. I think that's a good approach.
/* The above macro would have a limitation being that a comma cannot appear directly inside one of the sequence elements of the last argument (so, i.e. the type can't come from a metafunction invocation which takes more than one argument explicitly unless additional measures are taken). */
I find it reasonable considering a typedef can be used as a workaround. Regards, Nicolas