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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
// UNSUPPORTED: libcpp-no-deduction-guides
// template<class Compare, class Container>
// priority_queue(Compare, Container)
// -> priority_queue<typename Container::value_type, Container, Compare>;
//
// template<class InputIterator,
// class Compare = less<typename iterator_traits<InputIterator>::value_type>,
// class Container = vector<typename iterator_traits<InputIterator>::value_type>>
// priority_queue(InputIterator, InputIterator, Compare = Compare(), Container = Container())
// -> priority_queue<typename iterator_traits<InputIterator>::value_type, Container, Compare>;
//
// template<class Compare, class Container, class Allocator>
// priority_queue(Compare, Container, Allocator)
// -> priority_queue<typename Container::value_type, Container, Compare>;
#include <queue>
#include <vector>
#include <iterator>
#include <cassert>
#include <cstddef>
#include <climits> // INT_MAX
#include "test_macros.h"
#include "test_iterators.h"
#include "test_allocator.h"
struct A {};
int main(int, char**)
{
// Test the explicit deduction guides
{
std::vector<int> v{0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
std::priority_queue pri(std::greater<int>(), v); // priority_queue(Compare, Container)
static_assert(std::is_same_v<decltype(pri), std::priority_queue<int, std::vector<int>, std::greater<int>>>, "");
assert(pri.size() == v.size());
assert(pri.top() == 0);
}
{
std::vector<long, test_allocator<long>> v{10, 11, 12, 13, 14, 15, 16, 17, 18, 19 };
std::priority_queue pri(std::greater<long>(), v, test_allocator<long>(2)); // priority_queue(Compare, Container, Allocator)
static_assert(std::is_same_v<decltype(pri),
std::priority_queue<long, std::vector<long, test_allocator<long>>, std::greater<long>>>, "");
assert(pri.size() == v.size());
assert(pri.top() == 10);
}
{
std::vector<short> v{10, 11, 12, 13, 14, 15, 28, 17, 18, 19 };
std::priority_queue pri(v.begin(), v.end()); // priority_queue(Iter, Iter)
static_assert(std::is_same_v<decltype(pri), std::priority_queue<short>>, "");
assert(pri.size() == v.size());
assert(pri.top() == 28);
}
{
std::vector<double> v{10, 11, 12, 13, 6, 15, 28, 17, 18, 19 };
std::priority_queue pri(v.begin(), v.end(), std::greater<double>()); // priority_queue(Iter, Iter, Comp)
static_assert(std::is_same_v<decltype(pri), std::priority_queue<double, std::vector<double>, std::greater<double>>>, "");
assert(pri.size() == v.size());
assert(pri.top() == 6);
}
{
std::vector<double> v{10, 6, 15, 28, 4, 18, 19 };
std::deque<double> deq;
std::priority_queue pri(v.begin(), v.end(), std::greater<double>(), deq); // priority_queue(Iter, Iter, Comp, Container)
static_assert(std::is_same_v<decltype(pri), std::priority_queue<double, std::deque<double>, std::greater<double>>>, "");
assert(pri.size() == v.size());
assert(pri.top() == 4);
}
// Test the implicit deduction guides
{
// We don't expect this one to work - no way to implicitly get value_type
// std::priority_queue pri(std::allocator<int>()); // queue (allocator &)
}
{
std::priority_queue<float> source;
std::priority_queue pri(source); // priority_queue(priority_queue &)
static_assert(std::is_same_v<decltype(pri)::value_type, float>, "");
static_assert(std::is_same_v<decltype(pri)::container_type, std::vector<float>>, "");
assert(pri.size() == 0);
}
{
// This one is odd - you can pass an allocator in to use, but the allocator
// has to match the type of the one used by the underlying container
typedef long double T;
typedef std::greater<T> Comp;
typedef test_allocator<T> A;
typedef std::deque<T, A> Cont;
Cont c{2,3,0,1};
std::priority_queue<T, Cont, Comp> source(Comp(), c);
std::priority_queue pri(source, A(2)); // queue(queue &, allocator)
static_assert(std::is_same_v<decltype(pri)::value_type, T>, "");
static_assert(std::is_same_v<decltype(pri)::container_type, Cont>, "");
assert(pri.size() == 4);
assert(pri.top() == 0);
}
return 0;
}
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