//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
// <queue>
// 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;
}
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