ceph/src/boost/libs/mp11/test/mp_copy_if.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/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 struct X1 {};
  18 struct X2 {};
  19 struct X3 {};
  20
  21 using boost::mp11::mp_bool;
  22
  23 template<class N> using is_even = mp_bool<N::value % 2 == 0>;
  24
  25 int main()
  26 {
  27     using boost::mp11::mp_list;
  28     using boost::mp11::mp_copy_if;
  29
  30     {
  31         using L1 = mp_list<>;
  32
  33         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L1, std::is_const>, L1>));
  34
  35         using L2 = mp_list<X1, X1 const, X1*, X2 const, X2*, X3*>;
  36
  37         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L2, std::is_volatile>, L1>));
  38         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L2, std::is_const>, mp_list<X1 const, X2 const>>));
  39         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L2, std::is_pointer>, mp_list<X1*, X2*, X3*>>));
  40     }
  41
  42     {
  43         using L1 = std::tuple<>;
  44
  45         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L1, std::is_const>, L1>));
  46
  47         using L2 = std::tuple<X1, X1 const, X1*, X2 const, X2*, X3*>;
  48
  49         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L2, std::is_volatile>, L1>));
  50         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L2, std::is_const>, std::tuple<X1 const, X2 const>>));
  51         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_copy_if<L2, std::is_pointer>, std::tuple<X1*, X2*, X3*>>));
  52     }
  53
  54     using boost::mp11::mp_iota_c;
  55     using boost::mp11::mp_size_t;
  56
  57     {
  58         int const N = 12;
  59         using L1 = mp_iota_c<N>;
  60
  61         using R1 = mp_copy_if<L1, is_even>;
  62
  63         BOOST_TEST_TRAIT_TRUE((std::is_same<R1, mp_list<mp_size_t<0>, mp_size_t<2>, mp_size_t<4>, mp_size_t<6>, mp_size_t<8>, mp_size_t<10>>>));
  64     }
  65
  66     return boost::report_errors();
  67 }