55 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// typename tuple_element<I, std::pair<T1, T2> >::type&15// get(pair<T1, T2>&);16 17#include <utility>18#include <cassert>19 20#include "test_macros.h"21 22#if TEST_STD_VER > 1123struct S {24 std::pair<int, int> a;25 int k;26 constexpr S() : a{1,2}, k(std::get<0>(a)) {}27 };28 29constexpr std::pair<int, int> getP () { return { 3, 4 }; }30#endif31 32int main(int, char**)33{34 {35 typedef std::pair<int, short> P;36 P p(3, static_cast<short>(4));37 assert(std::get<0>(p) == 3);38 assert(std::get<1>(p) == 4);39 std::get<0>(p) = 5;40 std::get<1>(p) = 6;41 assert(std::get<0>(p) == 5);42 assert(std::get<1>(p) == 6);43 }44 45#if TEST_STD_VER > 1146 {47 static_assert(S().k == 1, "");48 static_assert(std::get<1>(getP()) == 4, "");49 }50#endif51 52 53 return 0;54}55