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

   1
   2 // Copyright 2017 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/mp11/algorithm.hpp>
  11 #include <boost/mp11/list.hpp>
  12 #include <boost/mp11/integral.hpp>
  13 #include <boost/core/lightweight_test_trait.hpp>
  14 #include <type_traits>
  15 #include <tuple>
  16
  17 using boost::mp11::mp_bool;
  18
  19 template<class T, class U> using sizeof_less = mp_bool<(sizeof(T) < sizeof(U))>;
  20
  21 int main()
  22 {
  23     using boost::mp11::mp_list;
  24     using boost::mp11::mp_min_element;
  25
  26     {
  27         using L1 = mp_list<void>;
  28
  29         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_min_element<L1, sizeof_less>, void>));
  30
  31         using L2 = mp_list<char[2], char[4], char[3], char[1]>;
  32
  33         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_min_element<L2, sizeof_less>, char[1]>));
  34
  35         using L3 = mp_list<char[2], char[4], char[2], char[3], char[1], char[2], char[1]>;
  36
  37         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_min_element<L3, sizeof_less>, char[1]>));
  38     }
  39
  40     {
  41         using L1 = std::tuple<void>;
  42
  43         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_min_element<L1, sizeof_less>, void>));
  44
  45         using L2 = std::tuple<char[2], char[4], char[3], char[1]>;
  46
  47         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_min_element<L2, sizeof_less>, char[1]>));
  48
  49         using L3 = std::tuple<char[2], char[4], char[2], char[3], char[1], char[2], char[1]>;
  50
  51         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_min_element<L3, sizeof_less>, char[1]>));
  52     }
  53
  54     return boost::report_errors();
  55 }