libcxx/test/std/utilities/utility/pairs/pair.astuple/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 // <utility>
  10
  11 // template <class T1, class T2> struct pair
  12
  13 // template<size_t I, class T1, class T2>
  14 //     const typename tuple_element<I, std::pair<T1, T2> >::type&&
  15 //     get(const pair<T1, T2>&&);
  16
  17 // UNSUPPORTED: c++03 && !stdlib=libc++
  18
  19 #include <utility>
  20 #include <memory>
  21 #include <type_traits>
  22 #include <cassert>
  23
  24 #include "test_macros.h"
  25
  26 int main(int, char**)
  27 {
  28     {
  29 #if TEST_STD_VER >= 11
  30     typedef std::pair<std::unique_ptr<int>, short> P;
  31     const P p(std::unique_ptr<int>(new int(3)), static_cast<short>(4));
  32     static_assert(std::is_same<const std::unique_ptr<int>&&, decltype(std::get<0>(std::move(p)))>::value, "");
  33     static_assert(noexcept(std::get<0>(std::move(p))), "");
  34     const std::unique_ptr<int>&& ptr = std::get<0>(std::move(p));
  35     assert(*ptr == 3);
  36 #endif
  37     }
  38
  39     {
  40     int x = 42;
  41     int const y = 43;
  42     std::pair<int&, int const&> const p(x, y);
  43     static_assert(std::is_same<int&, decltype(std::get<0>(std::move(p)))>::value, "");
  44     static_assert(std::is_same<int const&, decltype(std::get<1>(std::move(p)))>::value, "");
  45 #if TEST_STD_VER >= 11
  46     static_assert(noexcept(std::get<0>(std::move(p))), "");
  47     static_assert(noexcept(std::get<1>(std::move(p))), "");
  48 #endif
  49     }
  50
  51     {
  52 #if TEST_STD_VER >= 11
  53     int x = 42;
  54     int const y = 43;
  55     std::pair<int&&, int const&&> const p(std::move(x), std::move(y));
  56     static_assert(std::is_same<int&&, decltype(std::get<0>(std::move(p)))>::value, "");
  57     static_assert(noexcept(std::get<0>(std::move(p))), "");
  58     static_assert(std::is_same<int const&&, decltype(std::get<1>(std::move(p)))>::value, "");
  59     static_assert(noexcept(std::get<1>(std::move(p))), "");
  60 #endif
  61     }
  62
  63 #if TEST_STD_VER > 11
  64     {
  65     typedef std::pair<int, short> P;
  66     constexpr const P p1(3, static_cast<short>(4));
  67     static_assert(std::get<0>(std::move(p1)) == 3, "");
  68     static_assert(std::get<1>(std::move(p1)) == 4, "");
  69     }
  70 #endif
  71
  72   return 0;
  73 }