ceph/src/boost/libs/mp11/test/mp_front.cpp

   1
   2 //  Copyright 2015 Peter Dimov.
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 //
   6 // See accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt
   8
   9
  10 #include <boost/core/lightweight_test_trait.hpp>
  11 #include <boost/mp11/list.hpp>
  12 #include <type_traits>
  13 #include <tuple>
  14 #include <utility>
  15
  16 int main()
  17 {
  18     using boost::mp11::mp_list;
  19     using boost::mp11::mp_front;
  20     using boost::mp11::mp_first;
  21
  22     using L1 = mp_list<void>;
  23     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_front<L1>, void>));
  24     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_first<L1>, void>));
  25
  26     using L2 = mp_list<int[], void, float>;
  27     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_front<L2>, int[]>));
  28     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_first<L2>, int[]>));
  29
  30     using L3 = std::tuple<int>;
  31     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_front<L3>, int>));
  32     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_first<L3>, int>));
  33
  34     using L4 = std::pair<char, double>;
  35     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_front<L4>, char>));
  36     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_first<L4>, char>));
  37
  38     using L5 = std::add_const<void()>;
  39     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_front<L5>, void()>));
  40     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_first<L5>, void()>));
  41
  42     return boost::report_errors();
  43 }