1 // Copyright David Abrahams 2002. 2 // Distributed under the Boost Software License, Version 1.0. (See 3 // accompanying file LICENSE_1_0.txt or copy at 4 // http://www.boost.org/LICENSE_1_0.txt) 5 #include <boost/static_assert.hpp> 6 #include <boost/python/detail/if_else.hpp> 7 #include <boost/python/detail/type_traits.hpp> 8 9 typedef char c1; 10 typedef char c2[2]; 11 typedef char c3[3]; 12 typedef char c4[4]; 13 14 template <unsigned size> 15 struct choose 16 { 17 typedef typename boost::python::detail::if_< 18 (sizeof(c1) == size) 19 >::template then< 20 c1 21 >::template elif< 22 (sizeof(c2) == size) 23 >::template then< 24 c2 25 >::template elif< 26 (sizeof(c3) == size) 27 >::template then< 28 c3 29 >::template elif< 30 (sizeof(c4) == size) 31 >::template then< 32 c4 33 >::template else_<void*>::type type; 34 }; 35 main()36int main() 37 { 38 BOOST_STATIC_ASSERT((boost::python::detail::is_same<choose<1>::type,c1>::value)); 39 BOOST_STATIC_ASSERT((boost::python::detail::is_same<choose<2>::type,c2>::value)); 40 BOOST_STATIC_ASSERT((boost::python::detail::is_same<choose<3>::type,c3>::value)); 41 BOOST_STATIC_ASSERT((boost::python::detail::is_same<choose<4>::type,c4>::value)); 42 BOOST_STATIC_ASSERT((boost::python::detail::is_same<choose<5>::type,void*>::value)); 43 return 0; 44 } 45