ReferenceCount.hh

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#ifndef CRL_MULTISENSE_REFERENCECOUNT_HH
#define CRL_MULTISENSE_REFERENCECOUNT_HH

#include <stdint.h>

namespace crl {
namespace multisense {
namespace details {
namespace utility {

class ReferenceCount
{
public:
    
    bool isShared() const {
        if (m_countP && (*m_countP) > 1)
            return true;
        return false;
    }

    void reset() {
        release();
        m_countP = new int32_t(1);
    }

    ReferenceCount() 
        : m_countP(new int32_t(1)) {};

    ReferenceCount(const ReferenceCount& source) 
        : m_countP(source.m_countP) {
        share();
    }

    ~ReferenceCount() {
        release();
    }

    ReferenceCount& operator=(const ReferenceCount& source) {
        if (this != &source) {
            release();
            m_countP = source.m_countP;
            share();
        }
        return *this;
    }                  

private:

    volatile int32_t *m_countP;
        
    void share() {
        if (m_countP)
#if WIN32
            InterlockedIncrement((LONG*)m_countP);
#else
            __sync_fetch_and_add(m_countP, 1);
#endif
    }

    void release() {
        if (m_countP) {
#if WIN32
            int32_t count = InterlockedDecrement((LONG*)m_countP);
#else
            int32_t count = __sync_sub_and_fetch(m_countP, 1);
#endif
            if (count <= 0)
                delete m_countP;
            m_countP = NULL;
        }
    }
};

}}}} // namespaces

#endif /* #ifndef CRL_MULTISENSE_REFERENCECOUNT_HH */