ceph/src/boost/libs/hana/test/pair/make.cpp

   1 // Copyright Louis Dionne 2013-2016
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/hana/assert.hpp>
   6 #include <boost/hana/core/make.hpp>
   7 #include <boost/hana/first.hpp>
   8 #include <boost/hana/pair.hpp>
   9 #include <boost/hana/second.hpp>
  10 namespace hana = boost::hana;
  11
  12
  13 struct MoveOnly {
  14     int data_;
  15     MoveOnly(MoveOnly const&) = delete;
  16     MoveOnly& operator=(MoveOnly const&) = delete;
  17     MoveOnly(int data) : data_(data) { }
  18     MoveOnly(MoveOnly&& x) : data_(x.data_) { x.data_ = 0; }
  19
  20     MoveOnly& operator=(MoveOnly&& x)
  21     { data_ = x.data_; x.data_ = 0; return *this; }
  22
  23     bool operator==(const MoveOnly& x) const { return data_ == x.data_; }
  24 };
  25
  26 int main() {
  27     {
  28         hana::pair<int, short> p = hana::make_pair(3, 4);
  29         BOOST_HANA_RUNTIME_CHECK(hana::first(p) == 3);
  30         BOOST_HANA_RUNTIME_CHECK(hana::second(p) == 4);
  31     }
  32
  33     {
  34         hana::pair<MoveOnly, short> p = hana::make_pair(MoveOnly{3}, 4);
  35         BOOST_HANA_RUNTIME_CHECK(hana::first(p) == MoveOnly{3});
  36         BOOST_HANA_RUNTIME_CHECK(hana::second(p) == 4);
  37     }
  38
  39     {
  40         hana::pair<MoveOnly, short> p = hana::make_pair(3, 4);
  41         BOOST_HANA_RUNTIME_CHECK(hana::first(p) == MoveOnly{3});
  42         BOOST_HANA_RUNTIME_CHECK(hana::second(p) == 4);
  43     }
  44
  45     {
  46         constexpr hana::pair<int, short> p = hana::make_pair(3, 4);
  47         static_assert(hana::first(p) == 3, "");
  48         static_assert(hana::second(p) == 4, "");
  49     }
  50
  51     // equivalence with make<pair_tag>
  52     {
  53         constexpr hana::pair<int, short> p = hana::make<hana::pair_tag>(3, 4);
  54         static_assert(hana::first(p) == 3, "");
  55         static_assert(hana::second(p) == 4, "");
  56     }
  57 }