forked from OSchip/llvm-project
63 lines
1.4 KiB
C++
63 lines
1.4 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++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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TEST_CONSTEXPR_CXX14
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bool test_tie()
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{
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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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#if TEST_STD_VER >= 20
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res = std::make_tuple(101, nullptr, -1.0);
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assert(i == 101);
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assert(f == -1.0);
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#endif
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}
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return true;
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}
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int main(int, char**)
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{
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test_tie();
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#if TEST_STD_VER >= 14
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static_assert(test_tie(), "");
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#endif
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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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return 0;
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}
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