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66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <tuple>
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// template <class... Types> class tuple;
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// template<class... Types>
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// tuple<Types&...> tie(Types&... t);
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#if TEST_STD_VER > 11
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constexpr bool test_tie_constexpr() {
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{
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int i = 42;
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double f = 1.1;
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using ExpectT = std::tuple<int&, decltype(std::ignore)&, double&>;
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auto res = std::tie(i, std::ignore, f);
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static_assert(std::is_same<ExpectT, decltype(res)>::value, "");
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assert(&std::get<0>(res) == &i);
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assert(&std::get<1>(res) == &std::ignore);
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assert(&std::get<2>(res) == &f);
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// FIXME: If/when tuple gets constexpr assignment
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//res = std::make_tuple(101, nullptr, -1.0);
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}
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return true;
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}
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#endif
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int main(int, char**)
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{
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{
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int i = 0;
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std::string s;
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std::tie(i, std::ignore, s) = std::make_tuple(42, 3.14, "C++");
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assert(i == 42);
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assert(s == "C++");
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}
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#if TEST_STD_VER > 11
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{
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static constexpr int i = 42;
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static constexpr double f = 1.1;
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constexpr std::tuple<const int &, const double &> t = std::tie(i, f);
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static_assert ( std::get<0>(t) == 42, "" );
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static_assert ( std::get<1>(t) == 1.1, "" );
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}
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{
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static_assert(test_tie_constexpr(), "");
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}
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#endif
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return 0;
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}
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