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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <queue>
// UNSUPPORTED: c++03, c++11, c++14
// template<class Container>
// queue(Container) -> queue<typename Container::value_type, Container>;
//
// template<class Container, class Allocator>
// queue(Container, Allocator) -> queue<typename Container::value_type, Container>;
#include <array>
#include <queue>
#include <list>
#include <iterator>
#include <cassert>
#include <cstddef>
#include "deduction_guides_sfinae_checks.h"
#include "test_macros.h"
#include "test_iterators.h"
#include "test_allocator.h"
struct A {};
int main(int, char**)
{
// Test the explicit deduction guides
{
std::list<int> l{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
std::queue que(l);
static_assert(std::is_same_v<decltype(que), std::queue<int, std::list<int>>>, "");
assert(que.size() == l.size());
assert(que.back() == l.back());
}
{
std::list<long, test_allocator<long>> l{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
std::queue que(l, test_allocator<long>(0,2)); // different allocator
static_assert(std::is_same_v<decltype(que)::container_type, std::list<long, test_allocator<long>>>, "");
static_assert(std::is_same_v<decltype(que)::value_type, long>, "");
assert(que.size() == 10);
assert(que.back() == 19);
// I'd like to assert that we've gotten the right allocator in the queue, but
// I don't know how to get at the underlying container.
}
// Test the implicit deduction guides
{
// We don't expect this one to work - no way to implicitly get value_type
// std::queue que(std::allocator<int>()); // queue (allocator &)
}
{
std::queue<A> source;
std::queue que(source); // queue(queue &)
static_assert(std::is_same_v<decltype(que)::value_type, A>, "");
static_assert(std::is_same_v<decltype(que)::container_type, std::deque<A>>, "");
assert(que.size() == 0);
}
{
typedef short T;
typedef test_allocator<T> Alloc;
typedef std::list<T, Alloc> Cont;
typedef test_allocator<int> ConvertibleToAlloc;
static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
!std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
{
Cont cont;
std::queue que(cont, Alloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
{
Cont cont;
std::queue que(cont, ConvertibleToAlloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
{
Cont cont;
std::queue que(std::move(cont), Alloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
{
Cont cont;
std::queue que(std::move(cont), ConvertibleToAlloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
}
{
typedef short T;
typedef test_allocator<T> Alloc;
typedef std::list<T, Alloc> Cont;
typedef test_allocator<int> ConvertibleToAlloc;
static_assert(std::uses_allocator_v<Cont, ConvertibleToAlloc> &&
!std::is_same_v<typename Cont::allocator_type, ConvertibleToAlloc>);
{
std::queue<T, Cont> source;
std::queue que(source, Alloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
{
std::queue<T, Cont> source;
std::queue que(source, ConvertibleToAlloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
{
std::queue<T, Cont> source;
std::queue que(std::move(source), Alloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
{
std::queue<T, Cont> source;
std::queue que(std::move(source), ConvertibleToAlloc(2));
static_assert(std::is_same_v<decltype(que), std::queue<T, Cont>>);
}
}
// Deduction guides should be SFINAE'd away when given:
// - a "bad" allocator (that is, a type not qualifying as an allocator);
// - an allocator instead of a container;
// - an allocator and a container that uses a different allocator.
{
using Cont = std::list<int>;
using Alloc = std::allocator<int>;
using DiffAlloc = test_allocator<int>;
using Iter = int*;
struct NotIter{};
struct NotAlloc {};
static_assert(SFINAEs_away<std::queue, Alloc, NotAlloc>);
static_assert(SFINAEs_away<std::queue, Cont, NotAlloc>);
static_assert(SFINAEs_away<std::queue, Cont, DiffAlloc>);
static_assert(SFINAEs_away<std::queue, Iter, NotIter>);
#if TEST_STD_VER > 20
static_assert(SFINAEs_away<std::queue, Iter, NotIter, Alloc>);
static_assert(SFINAEs_away<std::queue, Iter, Iter, NotAlloc>);
#endif
}
#if TEST_STD_VER > 20
{
typedef short T;
typedef test_allocator<T> Alloc;
std::list<T> a;
{
std::queue q(a.begin(), a.end());
static_assert(std::is_same_v<decltype(q), std::queue<T>>);
}
{
std::queue q(a.begin(), a.end(), Alloc());
static_assert(std::is_same_v<decltype(q), std::queue<T, std::deque<T, Alloc>>>);
}
}
#endif
return 0;
}
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