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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<class... Types>
// tuple<Types&...> tie(Types&... t);
// UNSUPPORTED: c++03
#include <tuple>
#include <string>
#include <cassert>
#include "test_macros.h"
TEST_CONSTEXPR_CXX14
bool test_tie()
{
{
int i = 42;
double f = 1.1;
using ExpectT = std::tuple<int&, decltype(std::ignore)&, double&>;
auto res = std::tie(i, std::ignore, f);
static_assert(std::is_same<ExpectT, decltype(res)>::value, "");
assert(&std::get<0>(res) == &i);
assert(&std::get<1>(res) == &std::ignore);
assert(&std::get<2>(res) == &f);
#if TEST_STD_VER >= 20
res = std::make_tuple(101, nullptr, -1.0);
assert(i == 101);
assert(f == -1.0);
#endif
}
return true;
}
int main(int, char**)
{
test_tie();
#if TEST_STD_VER >= 14
static_assert(test_tie(), "");
#endif
{
int i = 0;
std::string s;
std::tie(i, std::ignore, s) = std::make_tuple(42, 3.14, "C++");
assert(i == 42);
assert(s == "C++");
}
return 0;
}
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