ceph/src/boost/libs/mp11/test/mp_max_element_q.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 struct Q_sizeof_less
  20 {
  21     template<class T, class U> using fn = mp_bool<(sizeof(T) < sizeof(U))>;
  22 };
  23
  24 int main()
  25 {
  26     using boost::mp11::mp_list;
  27     using boost::mp11::mp_max_element_q;
  28
  29     {
  30         using L1 = mp_list<void>;
  31
  32         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element_q<L1, Q_sizeof_less>, void>));
  33
  34         using L2 = mp_list<char[2], char[4], char[3], char[1]>;
  35
  36         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element_q<L2, Q_sizeof_less>, char[4]>));
  37
  38         using L3 = mp_list<char[2], char[4], char[2], char[3], char[1], char[2], char[1]>;
  39
  40         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element_q<L3, Q_sizeof_less>, char[4]>));
  41     }
  42
  43     {
  44         using L1 = std::tuple<void>;
  45
  46         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element_q<L1, Q_sizeof_less>, void>));
  47
  48         using L2 = std::tuple<char[2], char[4], char[3], char[1]>;
  49
  50         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element_q<L2, Q_sizeof_less>, char[4]>));
  51
  52         using L3 = std::tuple<char[2], char[4], char[2], char[3], char[1], char[2], char[1]>;
  53
  54         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_max_element_q<L3, Q_sizeof_less>, char[4]>));
  55     }
  56
  57     return boost::report_errors();
  58 }