libstdc++-v3/testsuite/experimental/array/make_array.cc

   1 // { dg-do compile { target c++14 } }
   2
   3 // Copyright (C) 2015-2019 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <experimental/array>
  21 #include <functional> // for std::ref and std::reference_wrapper
  22
  23 struct MoveOnly
  24 {
  25   MoveOnly() = default;
  26   MoveOnly(MoveOnly&&) = default;
  27   MoveOnly& operator=(MoveOnly&&) = default;
  28 };
  29
  30 void test01()
  31 {
  32   char x[42];
  33   std::array<char, 42> y = std::experimental::to_array(x);
  34   std::array<int, 5> z = std::experimental::make_array(1,2,3,4,5);
  35   std::array<long, 3> zz = std::experimental::make_array(1,2L, 3);
  36   std::array<MoveOnly, 1> zzz = std::experimental::make_array(MoveOnly{});
  37   int dummy;
  38   auto good = std::experimental::make_array<
  39     std::reference_wrapper<int>>(std::ref(dummy));
  40   constexpr char x2[42]{};
  41   constexpr std::array<char, 42> y2 = std::experimental::to_array(x2);
  42   constexpr std::array<int, 5> z2 =
  43     std::experimental::make_array(1,2,3,4,5);
  44   constexpr std::array<long, 3> zz2
  45     = std::experimental::make_array(1,2L, 3);
  46   constexpr std::array<MoveOnly, 1> zzz2 = std::experimental::make_array(MoveOnly{});
  47 }
  48
  49 void test02()
  50 {
  51   // PR libstdc++/79195
  52   struct A {};
  53   struct B : A {};
  54   struct C : A {};
  55   auto arr = std::experimental::make_array<A>(B{}, C{});
  56   static_assert(std::is_same<decltype(arr), std::array<A, 2>>::value, "");
  57 }