ios_project/proj.ios_mac/cocos2d-x/cocos/base/CCRef.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

http://www.cocos2d-x.org

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
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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****************************************************************************/

#ifndef __BASE_CCREF_H__
#define __BASE_CCREF_H__

#include "base/ccMacros.h"
#include "base/ccConfig.h"

#define CC_REF_LEAK_DETECTION 0

/**
 * @addtogroup base
 * @{
 */
NS_CC_BEGIN


class Ref;

/**
  * Interface that defines how to clone an Ref.
  * @lua NA
  * @js NA
  */
class CC_DLL Clonable
{
public:
    /** Returns a copy of the Ref. */
    virtual Clonable* clone() const = 0;

    /**
     * @js NA
     * @lua NA
     */
    virtual ~Clonable() {};
};

/**
 * Ref is used for reference count management. If a class inherits from Ref,
 * then it is easy to be shared in different places.
 * @js NA
 */
class CC_DLL Ref
{
public:
    /**
     * Retains the ownership.
     *
     * This increases the Ref's reference count.
     *
     * @see release, autorelease
     * @js NA
     */
    void retain();

    /**
     * Releases the ownership immediately.
     *
     * This decrements the Ref's reference count.
     *
     * If the reference count reaches 0 after the decrement, this Ref is
     * destructed.
     *
     * @see retain, autorelease
     * @js NA
     */
    void release();

    /**
     * Releases the ownership sometime soon automatically.
     *
     * This decrements the Ref's reference count at the end of current
     * autorelease pool block.
     *
     * If the reference count reaches 0 after the decrement, this Ref is
     * destructed.
     *
     * @returns The Ref itself.
     *
     * @see AutoreleasePool, retain, release
     * @js NA
     * @lua NA
     */
    Ref* autorelease();

    /**
     * Returns the Ref's current reference count.
     *
     * @returns The Ref's reference count.
     * @js NA
     */
    unsigned int getReferenceCount() const;

protected:
    /**
     * Constructor
     *
     * The Ref's reference count is 1 after construction.
     * @js NA
     */
    Ref();

    /**
     * Destructor
     *
     * @js NA
     * @lua NA
     */
    virtual ~Ref();

protected:
    /// count of references
    unsigned int _referenceCount;

    friend class AutoreleasePool;

    // Memory leak diagnostic data (only included when CC_REF_LEAK_DETECTION is defined and its value isn't zero)
#if CC_REF_LEAK_DETECTION
public:
    static void printLeaks();
#endif
};


NS_CC_END
// end of base group
/** @} */

#endif // __BASE_CCREF_H__