Memory.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef TRINITY_MEMORY_H
#define TRINITY_MEMORY_H
 
#include "CompilerDefs.h"
#include <concepts>
#include <memory>
 
#if TRINITY_COMPILER == TRINITY_COMPILER_GNU
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wignored-attributes"
#endif
 
namespace Trinity
{
namespace Impl
{
template<typename T, typename Del>
struct stateful_unique_ptr_deleter
{
    using pointer = T;
    explicit(false) stateful_unique_ptr_deleter(Del deleter) : _deleter(std::move(deleter)) { }
    void operator()(pointer ptr) const { (void)_deleter(ptr); }
 
private:
    Del _deleter;
};
 
template<typename T, auto Del>
struct stateless_unique_ptr_deleter
{
    using pointer = T;
    void operator()(pointer ptr) const
    {
        if constexpr (std::is_member_function_pointer_v<decltype(Del)>)
            (void)(ptr->*Del)();
        else
            (void)Del(ptr);
    }
};
}
 
template <typename Ptr, typename Del> requires std::invocable<Del, Ptr> && std::is_pointer_v<Ptr>
Impl::stateful_unique_ptr_deleter<Ptr, Del> unique_ptr_deleter(Del deleter)
{
    return Impl::stateful_unique_ptr_deleter<Ptr, Del>(std::move(deleter));
}
 
template <typename Ptr, auto Del> requires std::invocable<decltype(Del), Ptr> && std::is_pointer_v<Ptr>
Impl::stateless_unique_ptr_deleter<Ptr, Del> unique_ptr_deleter()
{
    return Impl::stateless_unique_ptr_deleter<Ptr, Del>();
}
 
template<typename Ptr, typename T = std::remove_pointer_t<Ptr>, typename Del> requires std::invocable<Del, Ptr> && std::is_pointer_v<Ptr>
std::unique_ptr<T, Impl::stateful_unique_ptr_deleter<Ptr, Del>> make_unique_ptr_with_deleter(Ptr ptr, Del deleter)
{
    return std::unique_ptr<T, Impl::stateful_unique_ptr_deleter<Ptr, Del>>(ptr, std::move(deleter));
}
 
template<auto Del, typename Ptr, typename T = std::remove_pointer_t<Ptr>> requires std::invocable<decltype(Del), Ptr> && std::is_pointer_v<Ptr>
std::unique_ptr<T, Impl::stateless_unique_ptr_deleter<Ptr, Del>> make_unique_ptr_with_deleter(Ptr ptr)
{
    return std::unique_ptr<T, Impl::stateless_unique_ptr_deleter<Ptr, Del>>(ptr);
}
}
 
#if TRINITY_COMPILER == TRINITY_COMPILER_GNU
#pragma GCC diagnostic pop
#endif
 
#endif // TRINITY_MEMORY_H