test/std/containers/container.adaptors/priority.queue/priqueue.cons/deduct.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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);
    }

    {
        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>>);
        }
    }

    return 0;
}