ceph/src/boost/libs/mp11/test/mp_eval_if_sf.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/utility.hpp>
  11 #include <boost/core/lightweight_test_trait.hpp>
  12 #include <type_traits>
  13
  14 using boost::mp11::mp_eval_if;
  15 using boost::mp11::mp_eval_if_q;
  16 using boost::mp11::mp_identity_t;
  17 using boost::mp11::mp_valid;
  18 using boost::mp11::mp_quote;
  19
  20 template<class C, class... A> using eval_if = mp_eval_if<C, void, mp_identity_t, A...>;
  21
  22 int main()
  23 {
  24     BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type>));
  25     BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type, void>));
  26     BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type, void, void>));
  27     BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type, void, void, void>));
  28
  29     BOOST_TEST_TRAIT_FALSE((mp_valid<eval_if, std::false_type>));
  30     BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::false_type, void>));
  31     BOOST_TEST_TRAIT_FALSE((mp_valid<eval_if, std::false_type, void, void>));
  32     BOOST_TEST_TRAIT_FALSE((mp_valid<eval_if, std::false_type, void, void, void>));
  33
  34     using Qi = mp_quote<mp_identity_t>;
  35
  36     BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi>));
  37     BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi, void>));
  38     BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi, void, void>));
  39     BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi, void, void, void>));
  40
  41     BOOST_TEST_TRAIT_FALSE((mp_valid<mp_eval_if_q, std::false_type, void, Qi>));
  42     BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::false_type, void, Qi, void>));
  43     BOOST_TEST_TRAIT_FALSE((mp_valid<mp_eval_if_q, std::false_type, void, Qi, void, void>));
  44     BOOST_TEST_TRAIT_FALSE((mp_valid<mp_eval_if_q, std::false_type, void, Qi, void, void, void>));
  45
  46     return boost::report_errors();
  47 }