ceph/src/boost/libs/hana/test/tuple/move_only.cpp

   1 // Copyright Louis Dionne 2013-2017
   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/at.hpp>
   6 #include <boost/hana/back.hpp>
   7 #include <boost/hana/front.hpp>
   8 #include <boost/hana/tuple.hpp>
   9
  10 #include <utility>
  11 namespace hana = boost::hana;
  12
  13
  14 // This test checks for move-only friendliness and reference semantics.
  15
  16 struct MoveOnly {
  17     MoveOnly() = default;
  18     MoveOnly(MoveOnly&&) = default;
  19     MoveOnly& operator=(MoveOnly&&) = default;
  20
  21     MoveOnly(MoveOnly const&) = delete;
  22     MoveOnly& operator=(MoveOnly const&) = delete;
  23 };
  24
  25 int main() {
  26     {
  27         auto xs = hana::make_tuple(MoveOnly{});
  28         auto by_val = [](auto) { };
  29
  30         by_val(std::move(xs));
  31         by_val(hana::front(std::move(xs)));
  32         by_val(hana::at_c<0>(std::move(xs)));
  33         by_val(hana::back(std::move(xs)));
  34     }
  35
  36     {
  37         auto const& xs = hana::make_tuple(MoveOnly{});
  38         auto by_const_ref = [](auto const&) { };
  39
  40         by_const_ref(xs);
  41         by_const_ref(hana::front(xs));
  42         by_const_ref(hana::at_c<0>(xs));
  43         by_const_ref(hana::back(xs));
  44     }
  45
  46     {
  47         auto xs = hana::make_tuple(MoveOnly{});
  48         auto by_ref = [](auto&) { };
  49
  50         by_ref(xs);
  51         by_ref(hana::front(xs));
  52         by_ref(hana::at_c<0>(xs));
  53         by_ref(hana::back(xs));
  54     }
  55 }