74 lines · 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-exception6//7//===----------------------------------------------------------------------===//8 9// <utility>10 11// template <class T1, class T2> struct pair12 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 26int main(int, char**)27{28 {29#if TEST_STD_VER >= 1130 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#endif37 }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 >= 1146 static_assert(noexcept(std::get<0>(std::move(p))), "");47 static_assert(noexcept(std::get<1>(std::move(p))), "");48#endif49 }50 51 {52#if TEST_STD_VER >= 1153 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#endif61 }62 63#if TEST_STD_VER > 1164 {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#endif71 72 return 0;73}74