test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp - llvm-project/libcxx - Git at Google

 //===----------------------------------------------------------------------===//
 //
 // 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 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>;
 //
 // template<ranges::input_range R, class Compare = less<ranges::range_value_t<R>>>
 //   priority_queue(from_range_t, R&&, Compare = Compare())
 //     -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>>, Compare>; // C++23
 //
 // template<ranges::input_range R, class Compare, class Allocator>
 //   priority_queue(from_range_t, R&&, Compare, Allocator)
 //     -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>,
 //                         Compare>; // C++23
 //
 // template<ranges::input_range R, class Allocator>
 //   priority_queue(from_range_t, R&&, Allocator)
 //     -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>>; // C++23

 #include <cassert>
 #include <climits> // INT_MAX
 #include <cstddef>
 #include <iterator>
 #include <queue>
 #include <vector>

 #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::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);
     }

     {
         typedef short T;
         typedef std::greater<T> Comp;
         typedef test_allocator<T> Alloc;
         typedef std::deque<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>);

         {
         Comp comp;
         Cont cont;
         std::priority_queue pri(comp, cont, Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Comp comp;
         Cont cont;
         std::priority_queue pri(comp, cont, ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Comp comp;
         Cont cont;
         std::priority_queue pri(comp, std::move(cont), Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Comp comp;
         Cont cont;
         std::priority_queue pri(comp, std::move(cont), ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }
     }

     {
         typedef short T;
         typedef signed char ConvertibleToT;
         typedef std::greater<T> Comp;
         typedef test_allocator<T> Alloc;
         typedef std::deque<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::priority_queue<T, Cont, Comp> source;
         std::priority_queue pri(source, Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         std::priority_queue<T, Cont, Comp> source;
         std::priority_queue pri(source, ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         std::priority_queue<T, Cont, Comp> source;
         std::priority_queue pri(std::move(source), Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         std::priority_queue<T, Cont, Comp> source;
         std::priority_queue pri(std::move(source), ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         std::priority_queue pri(Comp(), cont, Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         std::priority_queue pri(Comp(), cont, ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         std::priority_queue pri(Comp(), std::move(cont), Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         std::priority_queue pri(Comp(), std::move(cont), ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         T a[2] = {};
         std::priority_queue pri(a, a+2, Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, std::vector<T, Alloc>>>);
         }

         {
         T a[2] = {};
         std::priority_queue pri(a, a+2, Comp(), Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, std::vector<T, Alloc>, Comp>>);
         }

         {
         Cont cont;
         ConvertibleToT a[2] = {};
         std::priority_queue pri(a, a+2, Comp(), cont, Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         ConvertibleToT a[2] = {};
         std::priority_queue pri(a, a+2, Comp(), cont, ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         ConvertibleToT a[2] = {};
         std::priority_queue pri(a, a+2, Comp(), std::move(cont), Alloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

         {
         Cont cont;
         ConvertibleToT a[2] = {};
         std::priority_queue pri(a, a+2, Comp(), std::move(cont), ConvertibleToAlloc(2));
         static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
         }

 #if TEST_STD_VER >= 23
         { // (from_range, range)
           std::priority_queue c(std::from_range, Cont());
           static_assert(std::is_same_v<decltype(c), std::priority_queue<T>>);
         }

         { // (from_range, range, compare)
           std::priority_queue c(std::from_range, Cont(), Comp());
           static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T>, Comp>>);
         }

         { // (from_range, range, compare, alloc)
           std::priority_queue c(std::from_range, Cont(), Comp(), Alloc(2));
           static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T, Alloc>, Comp>>);
         }

         { // (from_range, range, alloc)
           std::priority_queue c(std::from_range, Cont(), Alloc(2));
           static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T, Alloc>>>);
         }
 #endif // TEST_STD_VER >= 23
     }

     // Deduction guides should be SFINAE'd away when given:
     // - "bad" input iterators (that is, a type not qualifying as an input
     //   iterator);
     // - a bad allocator;
     // - an allocator instead of a comparator;
     // - an allocator instead of a container;
     // - an allocator and a container that uses a different allocator.
     {
         using Comp = std::less<int>;
         using Cont = std::vector<int>;
         using Alloc = std::allocator<int>;
         using Iter = int*;

         // The only requirement in the Standard is that integral types cannot be
         // considered input iterators, beyond that it is unspecified.
         using BadIter = int;
 #ifdef _LIBCPP_VERSION
         struct OutputIter {
           using iterator_category = std::output_iterator_tag;
           using value_type = void;
           using difference_type = void;
           using pointer = void;
           using reference = void;

           const OutputIter& operator*() const { return *this; }
           const OutputIter& operator++() { return *this; }
           OutputIter operator++(int) const { return *this; }
         };
 #endif // _LIBCPP_VERSION

         struct BadAlloc {};
         using AllocAsComp = Alloc;
         using AllocAsCont = Alloc;
         using DiffAlloc = test_allocator<int>;

         // (iter, iter)
         //
         // Cannot deduce from (BAD_iter, BAD_iter)
         static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter>);
         // Note: (OutputIter, OutputIter) is interpreted as (comp, cont) and fails on accessing
         // non-existent typedefs in `OutputIter` (as if it were a container). There is no
         // requirement to SFINAE away bad containers.

         // (iter, iter, comp)
         //
         // Cannot deduce from (BAD_iter, BAD_iter, comp)
         static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp>);
         LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp>);
         // Note: (iter, iter, ALLOC_as_comp) is allowed -- it just calls (iter, iter, alloc).

         // (iter, iter, comp, cont)
         //
         // Cannot deduce from (BAD_iter, BAD_iter, comp, cont)
         static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp, Cont>);
         LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp, Cont>);
         // Cannot deduce from (iter, iter, ALLOC_as_comp, cont)
         static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Cont>);
         // Note: (iter, iter, comp, ALLOC_as_cont) is allowed -- it just calls (iter, iter, comp,
         // alloc).

         // (iter, iter, alloc)
         //
         // Cannot deduce from (BAD_iter, BAD_iter, alloc)
         static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Alloc>);
         LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Alloc>);
         // Note: (iter, iter, BAD_alloc) is interpreted as (iter, iter, comp) instead and fails upon
         // instantiation. There is no requirement to SFINAE away bad comparators.

         // (iter, iter, comp, alloc)
         //
         // Cannot deduce from (iter, iter, ALLOC_as_comp, alloc)
         static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Alloc>);
         // Note: (iter, iter, comp, BAD_alloc) is interpreted as (iter, iter, comp, cont) instead
         // and fails upon instantiation. There is no requirement to SFINAE away bad containers.

         // (iter, iter, comp, cont, alloc)
         //
         // Cannot deduce from (BAD_iter, BAD_iter, comp, cont, alloc)
         static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp, Cont, Alloc>);
         LIBCPP_STATIC_ASSERT(
             SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp, Cont, Alloc>);
         // Cannot deduce from (iter, iter, ALLOC_as_comp, cont, alloc)
         static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Cont, Alloc>);
         // Cannot deduce from (iter, iter, comp, ALLOC_as_cont, alloc)
         static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, AllocAsCont, Alloc>);
         // Cannot deduce from (iter, iter, comp, cont, BAD_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, Cont, BadAlloc>);
         // Cannot deduce from (iter, iter, comp, cont, DIFFERENT_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, Cont, DiffAlloc>);

         // (comp, alloc)
         //
         // Cannot deduce from (ALLOC_as_comp, alloc)
         static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Alloc>);
         // Cannot deduce from (comp, BAD_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Comp, BadAlloc>);

         // (comp, cont, alloc)
         //
         // Cannot deduce from (ALLOC_as_comp, cont, alloc)
         static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Cont, Alloc>);
         // Cannot deduce from (comp, ALLOC_as_cont, alloc)
         static_assert(SFINAEs_away<std::priority_queue, Comp, AllocAsCont, Alloc>);
         // Cannot deduce from (comp, cont, BAD_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Comp, Cont, BadAlloc>);
         // Cannot deduce from (comp, cont, DIFFERENT_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Comp, Cont, DiffAlloc>);

         // (comp, cont)
         //
         // Cannot deduce from (ALLOC_as_comp, cont)
         static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Cont>);
         // Cannot deduce from (comp, ALLOC_as_cont)
         static_assert(SFINAEs_away<std::priority_queue, Comp, AllocAsCont>);

 #if TEST_STD_VER >= 23
         using Range = RangeT<int>;
         using BadRange = BadRangeT<int>;

         // (from_range, range)
         //
         // Cannot deduce from (from_range, BAD_range)
         static_assert(SFINAEs_away<std::priority_queue, BadRange>);

         // (from_range, range, compare)
         //
         // Cannot deduce from (from_range, BAD_range, compare)
         static_assert(SFINAEs_away<std::priority_queue, BadRange, Comp>);

         // (from_range, range, compare, alloc)
         //
         // Cannot deduce from (from_range, BAD_range, compare, alloc)
         static_assert(SFINAEs_away<std::priority_queue, BadRange, Comp, Alloc>);
         // Cannot deduce from (from_range, range, compare, BAD_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Range, Comp, BadAlloc>);
         // Cannot deduce from (from_range, range, compare, DIFFERENT_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Range, Comp, DiffAlloc>);

         // (from_range, range, alloc)
         //
         // Cannot deduce from (from_range, BAD_range, alloc)
         static_assert(SFINAEs_away<std::priority_queue, BadRange, Alloc>);
         // Cannot deduce from (from_range, range, BAD_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Range, BadAlloc>);
         // Cannot deduce from (from_range, range, DIFFERENT_alloc)
         static_assert(SFINAEs_away<std::priority_queue, Range, DiffAlloc>);
 #endif // TEST_STD_VER >= 23
     }

     return 0;
 }
	//===----------------------------------------------------------------------===//
	//
	// 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 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>;
	//
	// template<ranges::input_range R, class Compare = less<ranges::range_value_t<R>>>
	// priority_queue(from_range_t, R&&, Compare = Compare())
	// -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>>, Compare>; // C++23
	//
	// template<ranges::input_range R, class Compare, class Allocator>
	// priority_queue(from_range_t, R&&, Compare, Allocator)
	// -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>,
	// Compare>; // C++23
	//
	// template<ranges::input_range R, class Allocator>
	// priority_queue(from_range_t, R&&, Allocator)
	// -> priority_queue<ranges::range_value_t<R>, vector<ranges::range_value_t<R>, Allocator>>; // C++23

	#include <cassert>
	#include <climits> // INT_MAX
	#include <cstddef>
	#include <iterator>
	#include <queue>
	#include <vector>

	#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::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);
	}

	{
	typedef short T;
	typedef std::greater<T> Comp;
	typedef test_allocator<T> Alloc;
	typedef std::deque<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>);

	{
	Comp comp;
	Cont cont;
	std::priority_queue pri(comp, cont, Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Comp comp;
	Cont cont;
	std::priority_queue pri(comp, cont, ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Comp comp;
	Cont cont;
	std::priority_queue pri(comp, std::move(cont), Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Comp comp;
	Cont cont;
	std::priority_queue pri(comp, std::move(cont), ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}
	}

	{
	typedef short T;
	typedef signed char ConvertibleToT;
	typedef std::greater<T> Comp;
	typedef test_allocator<T> Alloc;
	typedef std::deque<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::priority_queue<T, Cont, Comp> source;
	std::priority_queue pri(source, Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	std::priority_queue<T, Cont, Comp> source;
	std::priority_queue pri(source, ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	std::priority_queue<T, Cont, Comp> source;
	std::priority_queue pri(std::move(source), Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	std::priority_queue<T, Cont, Comp> source;
	std::priority_queue pri(std::move(source), ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	std::priority_queue pri(Comp(), cont, Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	std::priority_queue pri(Comp(), cont, ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	std::priority_queue pri(Comp(), std::move(cont), Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	std::priority_queue pri(Comp(), std::move(cont), ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	T a[2] = {};
	std::priority_queue pri(a, a+2, Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, std::vector<T, Alloc>>>);
	}

	{
	T a[2] = {};
	std::priority_queue pri(a, a+2, Comp(), Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, std::vector<T, Alloc>, Comp>>);
	}

	{
	Cont cont;
	ConvertibleToT a[2] = {};
	std::priority_queue pri(a, a+2, Comp(), cont, Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	ConvertibleToT a[2] = {};
	std::priority_queue pri(a, a+2, Comp(), cont, ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	ConvertibleToT a[2] = {};
	std::priority_queue pri(a, a+2, Comp(), std::move(cont), Alloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	{
	Cont cont;
	ConvertibleToT a[2] = {};
	std::priority_queue pri(a, a+2, Comp(), std::move(cont), ConvertibleToAlloc(2));
	static_assert(std::is_same_v<decltype(pri), std::priority_queue<T, Cont, Comp>>);
	}

	#if TEST_STD_VER >= 23
	{ // (from_range, range)
	std::priority_queue c(std::from_range, Cont());
	static_assert(std::is_same_v<decltype(c), std::priority_queue<T>>);
	}

	{ // (from_range, range, compare)
	std::priority_queue c(std::from_range, Cont(), Comp());
	static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T>, Comp>>);
	}

	{ // (from_range, range, compare, alloc)
	std::priority_queue c(std::from_range, Cont(), Comp(), Alloc(2));
	static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T, Alloc>, Comp>>);
	}

	{ // (from_range, range, alloc)
	std::priority_queue c(std::from_range, Cont(), Alloc(2));
	static_assert(std::is_same_v<decltype(c), std::priority_queue<T, std::vector<T, Alloc>>>);
	}
	#endif // TEST_STD_VER >= 23
	}

	// Deduction guides should be SFINAE'd away when given:
	// - "bad" input iterators (that is, a type not qualifying as an input
	// iterator);
	// - a bad allocator;
	// - an allocator instead of a comparator;
	// - an allocator instead of a container;
	// - an allocator and a container that uses a different allocator.
	{
	using Comp = std::less<int>;
	using Cont = std::vector<int>;
	using Alloc = std::allocator<int>;
	using Iter = int*;

	// The only requirement in the Standard is that integral types cannot be
	// considered input iterators, beyond that it is unspecified.
	using BadIter = int;
	#ifdef _LIBCPP_VERSION
	struct OutputIter {
	using iterator_category = std::output_iterator_tag;
	using value_type = void;
	using difference_type = void;
	using pointer = void;
	using reference = void;

	const OutputIter& operator() const { return this; }
	const OutputIter& operator++() { return *this; }
	OutputIter operator++(int) const { return *this; }
	};
	#endif // _LIBCPP_VERSION

	struct BadAlloc {};
	using AllocAsComp = Alloc;
	using AllocAsCont = Alloc;
	using DiffAlloc = test_allocator<int>;

	// (iter, iter)
	//
	// Cannot deduce from (BAD_iter, BAD_iter)
	static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter>);
	// Note: (OutputIter, OutputIter) is interpreted as (comp, cont) and fails on accessing
	// non-existent typedefs in `OutputIter` (as if it were a container). There is no
	// requirement to SFINAE away bad containers.

	// (iter, iter, comp)
	//
	// Cannot deduce from (BAD_iter, BAD_iter, comp)
	static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp>);
	LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp>);
	// Note: (iter, iter, ALLOC_as_comp) is allowed -- it just calls (iter, iter, alloc).

	// (iter, iter, comp, cont)
	//
	// Cannot deduce from (BAD_iter, BAD_iter, comp, cont)
	static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp, Cont>);
	LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp, Cont>);
	// Cannot deduce from (iter, iter, ALLOC_as_comp, cont)
	static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Cont>);
	// Note: (iter, iter, comp, ALLOC_as_cont) is allowed -- it just calls (iter, iter, comp,
	// alloc).

	// (iter, iter, alloc)
	//
	// Cannot deduce from (BAD_iter, BAD_iter, alloc)
	static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Alloc>);
	LIBCPP_STATIC_ASSERT(SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Alloc>);
	// Note: (iter, iter, BAD_alloc) is interpreted as (iter, iter, comp) instead and fails upon
	// instantiation. There is no requirement to SFINAE away bad comparators.

	// (iter, iter, comp, alloc)
	//
	// Cannot deduce from (iter, iter, ALLOC_as_comp, alloc)
	static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Alloc>);
	// Note: (iter, iter, comp, BAD_alloc) is interpreted as (iter, iter, comp, cont) instead
	// and fails upon instantiation. There is no requirement to SFINAE away bad containers.

	// (iter, iter, comp, cont, alloc)
	//
	// Cannot deduce from (BAD_iter, BAD_iter, comp, cont, alloc)
	static_assert(SFINAEs_away<std::priority_queue, BadIter, BadIter, Comp, Cont, Alloc>);
	LIBCPP_STATIC_ASSERT(
	SFINAEs_away<std::priority_queue, OutputIter, OutputIter, Comp, Cont, Alloc>);
	// Cannot deduce from (iter, iter, ALLOC_as_comp, cont, alloc)
	static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, AllocAsComp, Cont, Alloc>);
	// Cannot deduce from (iter, iter, comp, ALLOC_as_cont, alloc)
	static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, AllocAsCont, Alloc>);
	// Cannot deduce from (iter, iter, comp, cont, BAD_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, Cont, BadAlloc>);
	// Cannot deduce from (iter, iter, comp, cont, DIFFERENT_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Iter, Iter, Comp, Cont, DiffAlloc>);

	// (comp, alloc)
	//
	// Cannot deduce from (ALLOC_as_comp, alloc)
	static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Alloc>);
	// Cannot deduce from (comp, BAD_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Comp, BadAlloc>);

	// (comp, cont, alloc)
	//
	// Cannot deduce from (ALLOC_as_comp, cont, alloc)
	static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Cont, Alloc>);
	// Cannot deduce from (comp, ALLOC_as_cont, alloc)
	static_assert(SFINAEs_away<std::priority_queue, Comp, AllocAsCont, Alloc>);
	// Cannot deduce from (comp, cont, BAD_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Comp, Cont, BadAlloc>);
	// Cannot deduce from (comp, cont, DIFFERENT_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Comp, Cont, DiffAlloc>);

	// (comp, cont)
	//
	// Cannot deduce from (ALLOC_as_comp, cont)
	static_assert(SFINAEs_away<std::priority_queue, AllocAsComp, Cont>);
	// Cannot deduce from (comp, ALLOC_as_cont)
	static_assert(SFINAEs_away<std::priority_queue, Comp, AllocAsCont>);

	#if TEST_STD_VER >= 23
	using Range = RangeT<int>;
	using BadRange = BadRangeT<int>;

	// (from_range, range)
	//
	// Cannot deduce from (from_range, BAD_range)
	static_assert(SFINAEs_away<std::priority_queue, BadRange>);

	// (from_range, range, compare)
	//
	// Cannot deduce from (from_range, BAD_range, compare)
	static_assert(SFINAEs_away<std::priority_queue, BadRange, Comp>);

	// (from_range, range, compare, alloc)
	//
	// Cannot deduce from (from_range, BAD_range, compare, alloc)
	static_assert(SFINAEs_away<std::priority_queue, BadRange, Comp, Alloc>);
	// Cannot deduce from (from_range, range, compare, BAD_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Range, Comp, BadAlloc>);
	// Cannot deduce from (from_range, range, compare, DIFFERENT_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Range, Comp, DiffAlloc>);

	// (from_range, range, alloc)
	//
	// Cannot deduce from (from_range, BAD_range, alloc)
	static_assert(SFINAEs_away<std::priority_queue, BadRange, Alloc>);
	// Cannot deduce from (from_range, range, BAD_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Range, BadAlloc>);
	// Cannot deduce from (from_range, range, DIFFERENT_alloc)
	static_assert(SFINAEs_away<std::priority_queue, Range, DiffAlloc>);
	#endif // TEST_STD_VER >= 23
	}

	return 0;
	}