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93 lines
2.9 KiB
C++
93 lines
2.9 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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// <queue>
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// UNSUPPORTED: c++98, c++03, c++11, c++14
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// UNSUPPORTED: clang-5, apple-clang-9
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// UNSUPPORTED: libcpp-no-deduction-guides
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// Clang 5 will generate bad implicit deduction guides
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// Specifically, for the copy constructor.
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// template<class Container>
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// queue(Container) -> queue<typename Container::value_type, Container>;
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//
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// template<class Container, class Allocator>
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// queue(Container, Allocator) -> queue<typename Container::value_type, Container>;
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#include <queue>
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#include <list>
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#include <iterator>
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#include <cassert>
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#include <cstddef>
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#include <climits> // INT_MAX
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#include "test_macros.h"
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#include "test_iterators.h"
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#include "test_allocator.h"
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struct A {};
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int main(int, char**)
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{
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// Test the explicit deduction guides
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{
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std::list<int> l{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
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std::queue que(l);
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static_assert(std::is_same_v<decltype(que), std::queue<int, std::list<int>>>, "");
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assert(que.size() == l.size());
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assert(que.back() == l.back());
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}
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{
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std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
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std::queue que(l, test_allocator<long>(0,2)); // different allocator
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static_assert(std::is_same_v<decltype(que)::container_type, std::list<long, test_allocator<long>>>, "");
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static_assert(std::is_same_v<decltype(que)::value_type, long>, "");
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assert(que.size() == 10);
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assert(que.back() == 19);
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// I'd like to assert that we've gotten the right allocator in the queue, but
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// I don't know how to get at the underlying container.
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}
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// Test the implicit deduction guides
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{
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// We don't expect this one to work - no way to implicitly get value_type
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// std::queue que(std::allocator<int>()); // queue (allocator &)
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}
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{
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std::queue<A> source;
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std::queue que(source); // queue(queue &)
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static_assert(std::is_same_v<decltype(que)::value_type, A>, "");
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static_assert(std::is_same_v<decltype(que)::container_type, std::deque<A>>, "");
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assert(que.size() == 0);
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}
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{
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// This one is odd - you can pass an allocator in to use, but the allocator
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// has to match the type of the one used by the underlying container
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typedef short T;
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typedef test_allocator<T> A;
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typedef std::deque<T, A> C;
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C c{0,1,2,3};
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std::queue<T, C> source(c);
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std::queue que(source, A(2)); // queue(queue &, allocator)
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static_assert(std::is_same_v<decltype(que)::value_type, T>, "");
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static_assert(std::is_same_v<decltype(que)::container_type, C>, "");
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assert(que.size() == 4);
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assert(que.back() == 3);
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}
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return 0;
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}
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