| // Copyright David Abrahams 2002. |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| #include <boost/static_assert.hpp> |
| #include <boost/python/detail/if_else.hpp> |
| #include <boost/type_traits/same_traits.hpp> |
| |
| typedef char c1; |
| typedef char c2[2]; |
| typedef char c3[3]; |
| typedef char c4[4]; |
| |
| template <unsigned size> |
| struct choose |
| { |
| typedef typename boost::python::detail::if_< |
| (sizeof(c1) == size) |
| >::template then< |
| c1 |
| >::template elif< |
| (sizeof(c2) == size) |
| >::template then< |
| c2 |
| >::template elif< |
| (sizeof(c3) == size) |
| >::template then< |
| c3 |
| >::template elif< |
| (sizeof(c4) == size) |
| >::template then< |
| c4 |
| >::template else_<void*>::type type; |
| }; |
| |
| int main() |
| { |
| BOOST_STATIC_ASSERT((boost::is_same<choose<1>::type,c1>::value)); |
| BOOST_STATIC_ASSERT((boost::is_same<choose<2>::type,c2>::value)); |
| BOOST_STATIC_ASSERT((boost::is_same<choose<3>::type,c3>::value)); |
| BOOST_STATIC_ASSERT((boost::is_same<choose<4>::type,c4>::value)); |
| BOOST_STATIC_ASSERT((boost::is_same<choose<5>::type,void*>::value)); |
| return 0; |
| } |