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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <tuple>
// template <class... Types> class tuple;
// template <size_t I, class... Types>
// typename tuple_element<I, tuple<Types...> >::type const&
// get(const tuple<Types...>& t);
// UNSUPPORTED: c++98, c++03
#include <tuple>
#include <string>
#include <cassert>
#include "test_macros.h"
struct Empty {};
int main(int, char**)
{
{
typedef std::tuple<int> T;
const T t(3);
assert(std::get<0>(t) == 3);
}
{
typedef std::tuple<std::string, int> T;
const T t("high", 5);
assert(std::get<0>(t) == "high");
assert(std::get<1>(t) == 5);
}
#if TEST_STD_VER > 11
{
typedef std::tuple<double, int> T;
constexpr T t(2.718, 5);
static_assert(std::get<0>(t) == 2.718, "");
static_assert(std::get<1>(t) == 5, "");
}
{
typedef std::tuple<Empty> T;
constexpr T t{Empty()};
constexpr Empty e = std::get<0>(t);
((void)e); // Prevent unused warning
}
#endif
{
typedef std::tuple<double&, std::string, int> T;
double d = 1.5;
const T t(d, "high", 5);
assert(std::get<0>(t) == 1.5);
assert(std::get<1>(t) == "high");
assert(std::get<2>(t) == 5);
std::get<0>(t) = 2.5;
assert(std::get<0>(t) == 2.5);
assert(std::get<1>(t) == "high");
assert(std::get<2>(t) == 5);
assert(d == 2.5);
}
return 0;
}
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