//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// REQUIRES: c++experimental
// UNSUPPORTED: c++98, c++03

// <experimental/memory_resource>

// template <class T> class polymorphic_allocator

// template <class U1, class U2, class ...Args1, class ...Args2>
// void polymorphic_allocator<T>::construct(pair<U1, U2>*, piecewise_construct_t
//                                          tuple<Args1...>, tuple<Args2...>)

#include <experimental/memory_resource>
#include <type_traits>
#include <utility>
#include <tuple>
#include <cassert>
#include <cstdlib>
#include "uses_alloc_types.hpp"
#include "test_allocator.h"

namespace ex = std::experimental::pmr;

template <class T, class U, class ...TTuple, class ...UTuple>
bool doTest(UsesAllocatorType TExpect, UsesAllocatorType UExpect,
            std::tuple<TTuple...> ttuple, std::tuple<UTuple...> utuple)
{
    using P = std::pair<T, U>;
    TestResource R;
    ex::memory_resource * M = &R;
    ex::polymorphic_allocator<P> A(M);
    P * ptr = A.allocate(1);

    // UNDER TEST //
    A.construct(ptr, std::piecewise_construct, std::move(ttuple), std::move(utuple));
    // ------- //
    bool tres = checkConstruct<TTuple&&...>(ptr->first, TExpect, M);
    bool ures = checkConstruct<UTuple&&...>(ptr->second, UExpect, M);

    A.destroy(ptr);
    A.deallocate(ptr, 1);
    return tres && ures;
}

template <class Alloc, class ...TTypes, class ...UTypes>
void test_pmr_uses_allocator(std::tuple<TTypes...> ttuple, std::tuple<UTypes...> utuple)
{
    {
        using T = NotUsesAllocator<Alloc, sizeof...(TTypes)>;
        using U = NotUsesAllocator<Alloc, sizeof...(UTypes)>;
        assert((doTest<T, U>(UA_None, UA_None,
                             std::move(ttuple), std::move(utuple))));
    }
    {
        using T = UsesAllocatorV1<Alloc, sizeof...(TTypes)>;
        using U = UsesAllocatorV2<Alloc, sizeof...(UTypes)>;
        assert((doTest<T, U>(UA_AllocArg, UA_AllocLast,
                             std::move(ttuple), std::move(utuple))));
    }
    {
        using T = UsesAllocatorV2<Alloc, sizeof...(TTypes)>;
        using U = UsesAllocatorV3<Alloc, sizeof...(UTypes)>;
        assert((doTest<T, U>(UA_AllocLast, UA_AllocArg,
                             std::move(ttuple), std::move(utuple))));
    }
    {
        using T = UsesAllocatorV3<Alloc, sizeof...(TTypes)>;
        using U = NotUsesAllocator<Alloc, sizeof...(UTypes)>;
        assert((doTest<T, U>(UA_AllocArg, UA_None,
                             std::move(ttuple), std::move(utuple))));
    }
}

int main()
{
    using ERT = std::experimental::erased_type;
    using PMR = ex::memory_resource*;
    using PMA = ex::polymorphic_allocator<char>;
    {
        std::tuple<> t1;
        test_pmr_uses_allocator<ERT>(t1, t1);
        test_pmr_uses_allocator<PMR>(t1, t1);
        test_pmr_uses_allocator<PMA>(t1, t1);
    }
    {
        std::tuple<int> t1(42);
        std::tuple<> t2;
        test_pmr_uses_allocator<ERT>(t1, t2);
        test_pmr_uses_allocator<ERT>(t2, t1);
        test_pmr_uses_allocator<PMR>(t1, t2);
        test_pmr_uses_allocator<PMR>(t2, t1);
        test_pmr_uses_allocator<PMA>(t1, t2);
        test_pmr_uses_allocator<PMA>(t2, t1);
    }
    {
        std::tuple<int> t1(42);
        int x = 55;
        double dx = 42.42;
        std::tuple<int&, double&&> t2(x, std::move(dx));
        test_pmr_uses_allocator<ERT>(           t1, std::move(t2));
        test_pmr_uses_allocator<ERT>(std::move(t2),            t1);
        test_pmr_uses_allocator<PMR>(           t1, std::move(t2));
        test_pmr_uses_allocator<PMR>(std::move(t2),            t1);
        test_pmr_uses_allocator<PMA>(           t1, std::move(t2));
        test_pmr_uses_allocator<PMA>(std::move(t2),            t1);
    }
    {
        void* xptr = nullptr;
        long y = 4242;
        std::tuple<int, long const&, void*&> t1(42, y, xptr);
        int x = 55;
        double dx = 42.42;
        const char* s = "hello World";
        std::tuple<int&, double&&, const char*> t2(x, std::move(dx), s);
        test_pmr_uses_allocator<ERT>(           t1, std::move(t2));
        test_pmr_uses_allocator<ERT>(std::move(t2),            t1);
        test_pmr_uses_allocator<PMR>(           t1, std::move(t2));
        test_pmr_uses_allocator<PMR>(std::move(t2),            t1);
        test_pmr_uses_allocator<PMA>(           t1, std::move(t2));
        test_pmr_uses_allocator<PMA>(std::move(t2),            t1);
    }
}
