RefBase.h

Go to the documentation of this file.

/********************************************************************
 *
 *  Project     Artec 3D Scanning SDK
 *
 *  Purpose:    Ref counter declaration
 *
 *  Copyright:  Artec Group
 *
 ********************************************************************/

#ifndef _REF_H_
#define _REF_H_

#ifdef _WIN32
#include <intrin.h>
#endif

#define IMPLEMENT_IREF                          \
    virtual int addRef() const                  \
    {                                           \
        return ref_.addRef();                   \
    }                                           \
    virtual int release() const                 \
    {                                           \
        long refCount = ref_.release();         \
        if (refCount == 0)                      \
            delete this;                        \
                                                \
        return refCount;                        \
    }                                           \
private:                                        \
    artec::sdk::base::details::RefCounter ref_; \
public:

namespace artec { namespace sdk { namespace base
{
namespace details
{

/**
* Basic reference implementation of IRef interface
*/
class RefCounter
{
public:
    RefCounter() : refCount_(1) {}

    int addRef() const
    {
#ifdef _WIN32
        return _InterlockedIncrement((volatile long*)&refCount_);
#else
        // We assume that Linux or OS X here
        return __sync_add_and_fetch(&refCount_, 1);
#endif
    }

    int release() const
    {
#ifdef _WIN32
        return _InterlockedDecrement((volatile long*)&refCount_);
#else
        // We assume that Linux or OS X is here
        return __sync_sub_and_fetch(&refCount_, 1);
#endif
    }

private:
    mutable volatile int refCount_;
};

} // namespace details

/// Implementation of IRef interface. To create your own class, inherit it from RefBase.
template <class Interface> class RefBase : public Interface
{
public:
    IMPLEMENT_IREF;
    virtual ~RefBase() {}
};

} } } // namespace artec::sdk::base

#endif // _REF_H_