TSharedPointer.h

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/*
 * MIT License
 *
 * Copyright (c) 2025 Roberto Charreton
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * In addition, any project or software that uses this library or class must include
 * the following acknowledgment in the credits:
 *
 * "This project uses software developed by Roberto Charreton and Attribute Overload."
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
*/
#pragma once
 
namespace EU {
  template<typename T>
  class TSharedPointer
  {
  public:
    TSharedPointer() : ptr(nullptr), refCount(nullptr) {}
 
    explicit TSharedPointer(T* rawPtr) : ptr(rawPtr), refCount(new int(1)) {}
 
    TSharedPointer(T* rawPtr, int* existingRefCount) : ptr(rawPtr), refCount(existingRefCount)
    {
      if (refCount)
      {
        ++(*refCount);
      }
    }
 
    TSharedPointer(const TSharedPointer<T>& other) : ptr(other.ptr), refCount(other.refCount)
    {
      if (refCount)
      {
        ++(*refCount);
      }
    }
 
    TSharedPointer(TSharedPointer<T>&& other) noexcept : ptr(other.ptr), refCount(other.refCount)
    {
      other.ptr = nullptr;
      other.refCount = nullptr;
    }
 
    TSharedPointer<T>& operator=(const TSharedPointer<T>& other)
    {
      if (this != &other)
      {
        // Disminuir el recuento de referencias del objeto actual
        if (refCount && --(*refCount) == 0)
        {
          delete ptr;
          delete refCount;
        }
        // Copiar datos del otro puntero compartido
        ptr = other.ptr;
        refCount = other.refCount;
        if (refCount)
        {
          ++(*refCount);
        }
      }
      return *this;
    }
 
    TSharedPointer<T>& operator=(TSharedPointer<T>&& other) noexcept
    {
      if (this != &other)
      {
        // Liberar el objeto actual
        if (refCount && --(*refCount) == 0)
        {
          delete ptr;
          delete refCount;
        }
        // Transferir los datos del otro puntero compartido
        ptr = other.ptr;
        refCount = other.refCount;
        other.ptr = nullptr;
        other.refCount = nullptr;
      }
      return *this;
    }
 
    ~TSharedPointer()
    {
      if (refCount && --(*refCount) == 0)
      {
        delete ptr;
        delete refCount;
      }
    }
 
    T& operator*() const { return *ptr; }
 
    T* operator->() const { return ptr; }
 
    // Agregar una función para comprobar si el puntero es válido
    operator bool() const {
      return ptr != nullptr;
    }
 
    T* get() const { return ptr; }
 
    bool isNull() const { return ptr == nullptr; }
 
 
  public:
    T* ptr;       
    int* refCount; 
 
    void swap(TSharedPointer<T>& other) noexcept
    {
      T* tempPtr = other.ptr;
      int* tempRefCount = other.refCount;
 
      other.ptr = this->ptr;
      other.refCount = this->refCount;
 
      this->ptr = tempPtr;
      this->refCount = tempRefCount;
    }
 
    void reset(T* newPtr = nullptr)
    {
      // Disminuir el recuento de referencias del objeto actual
      if (refCount && --(*refCount) == 0)
      {
        delete ptr;
        delete refCount;
      }
 
      // Si newPtr es nullptr, asignar nullptr al puntero y recuento de referencias
      if (newPtr == nullptr)
      {
        ptr = nullptr;
        refCount = nullptr;
      }
      else
      {
        // Asignar nuevo objeto y manejar el recuento de referencias
        ptr = newPtr;
        refCount = new int(1);
      }
    }
 
    // Método de conversión para hacer cast dinámico
    template<typename U>
    TSharedPointer<U> dynamic_pointer_cast() const {
      // Intenta convertir el puntero de tipo T a U
      U* castedPtr = dynamic_cast<U*>(ptr);
      if (castedPtr) {
        // Si la conversión es exitosa, devuelve un nuevo TSharedPointer<U>
        return TSharedPointer<U>(castedPtr, refCount);
      }
      else {
        // Si falla la conversión, devuelve un TSharedPointer<U> nulo
        return TSharedPointer<U>();
      }
    }
  };
 
  
  template<typename T, typename... Args>
  TSharedPointer<T> MakeShared(Args... args)
  {
    return TSharedPointer<T>(new T(args...));
  }
}