70 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// <tuple>10 11// template <class... Types> class tuple;12 13// template <size_t I, class... Types>14// typename tuple_element<I, tuple<Types...> >::type const&15// get(const tuple<Types...>& t);16 17// UNSUPPORTED: c++0318 19#include <tuple>20#include <string>21#include <cassert>22 23#include "test_macros.h"24 25struct Empty {};26 27int main(int, char**)28{29 {30 typedef std::tuple<int> T;31 const T t(3);32 assert(std::get<0>(t) == 3);33 }34 {35 typedef std::tuple<std::string, int> T;36 const T t("high", 5);37 assert(std::get<0>(t) == "high");38 assert(std::get<1>(t) == 5);39 }40#if TEST_STD_VER > 1141 {42 typedef std::tuple<double, int> T;43 constexpr T t(2.718, 5);44 static_assert(std::get<0>(t) == 2.718, "");45 static_assert(std::get<1>(t) == 5, "");46 }47 {48 typedef std::tuple<Empty> T;49 constexpr T t{Empty()};50 constexpr Empty e = std::get<0>(t);51 ((void)e); // Prevent unused warning52 }53#endif54 {55 typedef std::tuple<double&, std::string, int> T;56 double d = 1.5;57 const T t(d, "high", 5);58 assert(std::get<0>(t) == 1.5);59 assert(std::get<1>(t) == "high");60 assert(std::get<2>(t) == 5);61 std::get<0>(t) = 2.5;62 assert(std::get<0>(t) == 2.5);63 assert(std::get<1>(t) == "high");64 assert(std::get<2>(t) == 5);65 assert(d == 2.5);66 }67 68 return 0;69}70