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++98, 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 // std::array is explicitly allowed to be initialized with A a = { init-list };.
  24 // Disable the missing braces warning for this reason.
  25 #include "disable_missing_braces_warning.h"
  26
  27 int main(int, char**)
  28 {
  29
  30     {
  31     typedef std::unique_ptr<double> T;
  32     typedef std::array<T, 1> C;
  33     const C c = {std::unique_ptr<double>(new double(3.5))};
  34     static_assert(std::is_same<const T&&, decltype(std::get<0>(std::move(c)))>::value, "");
  35     static_assert(noexcept(std::get<0>(std::move(c))), "");
  36     const T&& t = std::get<0>(std::move(c));
  37     assert(*t == 3.5);
  38     }
  39
  40 #if TEST_STD_VER > 11
  41     {
  42     typedef double T;
  43     typedef std::array<T, 3> C;
  44     constexpr const C c = {1, 2, 3.5};
  45     static_assert(std::get<0>(std::move(c)) == 1, "");
  46     static_assert(std::get<1>(std::move(c)) == 2, "");
  47     static_assert(std::get<2>(std::move(c)) == 3.5, "");
  48     }
  49 #endif
  50
  51   return 0;
  52 }