APool.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <functional>
#include <AUI/Common/AQueue.h>
#include <AUI/Common/SharedPtrTypes.h>
 
template<typename T>
class APool: public aui::noncopyable {
private:
   using Factory = std::function<_unique<T>()>;
   Factory mFactory;
   AQueue<_unique<T>> mQueue;
   std::shared_ptr<bool> mPoolAlive = std::make_shared<bool>(true);
 
 
   template <typename Ptr = _<T>>
   Ptr getImpl() noexcept {
       _unique<T> t;
       if (mQueue.empty()) {
           t = mFactory();
       } else {
           t = std::move(mQueue.front());
           mQueue.pop();
       }
       if constexpr (std::is_same_v<Ptr, _<T>>) {
           return aui::ptr::manage(t.release(), APoolDeleter(this));
       } else {
           return std::unique_ptr<T, APoolDeleter>(t.release(), APoolDeleter(this));
       }
   }
 
public:
   explicit APool(Factory factory) noexcept : mFactory(std::move(factory)) {}
 
   struct APoolDeleter {
       APool<T>* pool;
       std::shared_ptr<bool> poolAlive;
 
       APoolDeleter(APool<T>* pool) : pool(pool), poolAlive(pool->mPoolAlive) {}
 
       void operator()(T* t) {
           if (*poolAlive) {
               pool->mQueue.push(_unique<T>(t));
           } else {
               delete t;
           }
       }
   };
 
   ~APool() {
       *mPoolAlive = false;
   }
   auto get() noexcept {
       return getImpl<_<T>>();
   }
 
   using UniquePtr = std::unique_ptr<T, APoolDeleter>;
 
   auto getUnique() noexcept {
       return getImpl<UniquePtr>();
   }
};
 

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