libcxx/test/std/containers/sequences/array/array.tuple/get_const_rv.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <array>
  10
  11 // template <size_t I, class T, size_t N> const T&& get(const array<T, N>&& a);
  12
  13 // UNSUPPORTED: c++03
  14
  15 #include <array>
  16 #include <memory>
  17 #include <type_traits>
  18 #include <utility>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22
  23 int main(int, char**)
  24 {
  25
  26     {
  27         typedef std::unique_ptr<double> T;
  28         typedef std::array<T, 1> C;
  29         const C c = {std::unique_ptr<double>(new double(3.5))};
  30         static_assert(std::is_same<const T&&, decltype(std::get<0>(std::move(c)))>::value, "");
  31         static_assert(noexcept(std::get<0>(std::move(c))), "");
  32         const T&& t = std::get<0>(std::move(c));
  33         assert(*t == 3.5);
  34     }
  35
  36 #if TEST_STD_VER >= 14
  37     {
  38         typedef double T;
  39         typedef std::array<T, 3> C;
  40         constexpr const C c = {1, 2, 3.5};
  41         static_assert(std::get<0>(std::move(c)) == 1, "");
  42         static_assert(std::get<1>(std::move(c)) == 2, "");
  43         static_assert(std::get<2>(std::move(c)) == 3.5, "");
  44     }
  45 #endif
  46
  47     return 0;
  48 }