boost/libs/python/test/if_else.cpp

   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/type_traits/same_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
  36 int main()
  37 {
  38     BOOST_STATIC_ASSERT((boost::is_same<choose<1>::type,c1>::value));
  39     BOOST_STATIC_ASSERT((boost::is_same<choose<2>::type,c2>::value));
  40     BOOST_STATIC_ASSERT((boost::is_same<choose<3>::type,c3>::value));
  41     BOOST_STATIC_ASSERT((boost::is_same<choose<4>::type,c4>::value));
  42     BOOST_STATIC_ASSERT((boost::is_same<choose<5>::type,void*>::value));
  43     return 0;
  44 }