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

   1
   2 //  Copyright 2015 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 #include <utility>
  17
  18 struct X1 {};
  19 struct X2 {};
  20 struct X3 {};
  21 struct X4 {};
  22 struct X5 {};
  23
  24 int main()
  25 {
  26     using boost::mp11::mp_list;
  27     using boost::mp11::mp_take;
  28     using boost::mp11::mp_take_c;
  29     using boost::mp11::mp_size_t;
  30
  31     {
  32         using L1 = mp_list<>;
  33
  34         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L1, 0>, L1>));
  35         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L1, mp_size_t<0>>, L1>));
  36
  37         using L2 = mp_list<X1, X2, X3, X4, X5>;
  38
  39         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 0>, mp_list<>>));
  40         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 1>, mp_list<X1>>));
  41         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 2>, mp_list<X1, X2>>));
  42         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 3>, mp_list<X1, X2, X3>>));
  43         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 4>, mp_list<X1, X2, X3, X4>>));
  44         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 5>, mp_list<X1, X2, X3, X4, X5>>));
  45
  46         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<0>>, mp_list<>>));
  47         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<1>>, mp_list<X1>>));
  48         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<2>>, mp_list<X1, X2>>));
  49         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<3>>, mp_list<X1, X2, X3>>));
  50         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<4>>, mp_list<X1, X2, X3, X4>>));
  51         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<5>>, mp_list<X1, X2, X3, X4, X5>>));
  52
  53         using L3 = mp_list<X1, X2, X3, X4, X5, X1, X2, X3, X4, X5, X1, X2, X3, X4, X5, X1, X2, X3, X4, X5>;
  54
  55         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L3, 8>, mp_list<X1, X2, X3, X4, X5, X1, X2, X3>>));
  56         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L3, mp_size_t<9>>, mp_list<X1, X2, X3, X4, X5, X1, X2, X3, X4>>));
  57     }
  58
  59     {
  60         using L1 = std::tuple<>;
  61
  62         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L1, 0>, L1>));
  63         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L1, mp_size_t<0>>, L1>));
  64
  65         using L2 = std::tuple<X1, X2, X3, X4, X5>;
  66
  67         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 0>, std::tuple<>>));
  68         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 1>, std::tuple<X1>>));
  69         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 2>, std::tuple<X1, X2>>));
  70         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 3>, std::tuple<X1, X2, X3>>));
  71         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 4>, std::tuple<X1, X2, X3, X4>>));
  72         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L2, 5>, std::tuple<X1, X2, X3, X4, X5>>));
  73
  74         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<0>>, std::tuple<>>));
  75         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<1>>, std::tuple<X1>>));
  76         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<2>>, std::tuple<X1, X2>>));
  77         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<3>>, std::tuple<X1, X2, X3>>));
  78         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<4>>, std::tuple<X1, X2, X3, X4>>));
  79         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L2, mp_size_t<5>>, std::tuple<X1, X2, X3, X4, X5>>));
  80
  81         using L3 = std::tuple<X1, X2, X3, X4, X5, X1, X2, X3, X4, X5, X1, X2, X3, X4, X5, X1, X2, X3, X4, X5>;
  82
  83         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L3, 8>, std::tuple<X1, X2, X3, X4, X5, X1, X2, X3>>));
  84         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L3, mp_size_t<9>>, std::tuple<X1, X2, X3, X4, X5, X1, X2, X3, X4>>));
  85     }
  86
  87     {
  88         using L1 = std::pair<X1, X2>;
  89
  90         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take_c<L1, 2>, L1>));
  91         BOOST_TEST_TRAIT_TRUE((std::is_same<mp_take<L1, mp_size_t<2>>, L1>));
  92     }
  93
  94     return boost::report_errors();
  95 }