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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <tuple>
// template <class... Types> class tuple;
// template<class... Types>
// tuple<Types&...> tie(Types&... t);
// UNSUPPORTED: c++98, c++03
#include <tuple>
#include <string>
#include <cassert>
#include "test_macros.h"
#if TEST_STD_VER > 11
constexpr bool test_tie_constexpr() {
{
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);
// FIXME: If/when tuple gets constexpr assignment
//res = std::make_tuple(101, nullptr, -1.0);
}
return true;
}
#endif
int main()
{
{
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++");
}
#if TEST_STD_VER > 11
{
static constexpr int i = 42;
static constexpr double f = 1.1;
constexpr std::tuple<const int &, const double &> t = std::tie(i, f);
static_assert ( std::get<0>(t) == 42, "" );
static_assert ( std::get<1>(t) == 1.1, "" );
}
{
static_assert(test_tie_constexpr(), "");
}
#endif
}
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