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63 lines
1.8 KiB
C++
63 lines
1.8 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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// UNSUPPORTED: c++98, c++03
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// <stack>
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// template <class... Args> decltype(auto) emplace(Args&&... args);
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// return type is 'decltype(auto)' in C++17; 'void' before
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// whatever the return type of the underlying container's emplace_back() returns.
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#include <stack>
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#include <cassert>
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#include <vector>
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#include "test_macros.h"
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#include "../../../Emplaceable.h"
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template <typename Stack>
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void test_return_type() {
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typedef typename Stack::container_type Container;
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typedef typename Container::value_type value_type;
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typedef decltype(std::declval<Stack>().emplace(std::declval<value_type &>())) stack_return_type;
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#if TEST_STD_VER > 14
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typedef decltype(std::declval<Container>().emplace_back(std::declval<value_type>())) container_return_type;
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static_assert(std::is_same<stack_return_type, container_return_type>::value, "");
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#else
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static_assert(std::is_same<stack_return_type, void>::value, "");
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#endif
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}
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int main(int, char**)
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{
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test_return_type<std::stack<int> > ();
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test_return_type<std::stack<int, std::vector<int> > > ();
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std::stack<Emplaceable> q;
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#if TEST_STD_VER > 14
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typedef Emplaceable T;
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T& r1 = q.emplace(1, 2.5);
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assert(&r1 == &q.top());
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T& r2 = q.emplace(2, 3.5);
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assert(&r2 == &q.top());
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T& r3 = q.emplace(3, 4.5);
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assert(&r3 == &q.top());
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#else
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q.emplace(1, 2.5);
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q.emplace(2, 3.5);
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q.emplace(3, 4.5);
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#endif
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assert(q.size() == 3);
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assert(q.top() == Emplaceable(3, 4.5));
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return 0;
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}
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