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

   1
   2 //  Copyright 2015, 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/utility.hpp>
  11 #include <boost/mp11/integral.hpp>
  12 #include <boost/core/lightweight_test_trait.hpp>
  13 #include <type_traits>
  14
  15 using boost::mp11::mp_invoke;
  16 using boost::mp11::mp_size_t;
  17
  18 struct Q1
  19 {
  20     template<class...> using fn = void;
  21 };
  22
  23 struct Q2
  24 {
  25     template<class...> class fn;
  26 };
  27
  28 struct Q3
  29 {
  30     template<class... T> using fn = mp_size_t<sizeof...(T)>;
  31 };
  32
  33 struct Q4
  34 {
  35     template<class T1, class... T> using fn = T1;
  36 };
  37
  38 struct Q5
  39 {
  40     template<class T1, class T2> using fn = T2;
  41 };
  42
  43 int main()
  44 {
  45     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q1>, void>));
  46     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q1, int>, void>));
  47     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q1, int[], char[]>, void>));
  48
  49     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q2>, Q2::fn<>>));
  50     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q2, int>, Q2::fn<int>>));
  51     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q2, int[], char[]>, Q2::fn<int[], char[]>>));
  52
  53     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q3>, mp_size_t<0>>));
  54     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q3, int>, mp_size_t<1>>));
  55     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q3, int[], char[]>, mp_size_t<2>>));
  56
  57     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q4, int>, int>));
  58     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q4, int[], char[]>, int[]>));
  59
  60     BOOST_TEST_TRAIT_TRUE((std::is_same<mp_invoke<Q5, int, float>, float>));
  61
  62     return boost::report_errors();
  63 }