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#ifndef APE_ROLLBUFFER_H
#define APE_ROLLBUFFER_H
template <class TYPE> class CRollBuffer
{
public:
CRollBuffer()
{
m_pData = NULL;
m_pCurrent = NULL;
}
~CRollBuffer()
{
SAFE_ARRAY_DELETE(m_pData);
}
int Create(int nWindowElements, int nHistoryElements)
{
SAFE_ARRAY_DELETE(m_pData)
m_nWindowElements = nWindowElements;
m_nHistoryElements = nHistoryElements;
m_pData = new TYPE[m_nWindowElements + m_nHistoryElements];
if (m_pData == NULL)
return ERROR_INSUFFICIENT_MEMORY;
Flush();
return 0;
}
void Flush()
{
ZeroMemory(m_pData, (m_nHistoryElements + 1) * sizeof(TYPE));
m_pCurrent = &m_pData[m_nHistoryElements];
}
void Roll()
{
memcpy(&m_pData[0], &m_pCurrent[-m_nHistoryElements], m_nHistoryElements * sizeof(TYPE));
m_pCurrent = &m_pData[m_nHistoryElements];
}
__inline void IncrementSafe()
{
m_pCurrent++;
if (m_pCurrent == &m_pData[m_nWindowElements + m_nHistoryElements])
Roll();
}
__inline void IncrementFast()
{
m_pCurrent++;
}
__inline TYPE & operator[](const int nIndex) const
{
return m_pCurrent[nIndex];
}
protected:
TYPE * m_pData;
TYPE * m_pCurrent;
int m_nHistoryElements;
int m_nWindowElements;
};
template <class TYPE, int WINDOW_ELEMENTS, int HISTORY_ELEMENTS> class CRollBufferFast
{
public:
CRollBufferFast()
{
m_pData = new TYPE[WINDOW_ELEMENTS + HISTORY_ELEMENTS];
Flush();
}
~CRollBufferFast()
{
SAFE_ARRAY_DELETE(m_pData);
}
void Flush()
{
ZeroMemory(m_pData, (HISTORY_ELEMENTS + 1) * sizeof(TYPE));
m_pCurrent = &m_pData[HISTORY_ELEMENTS];
}
void Roll()
{
memcpy(&m_pData[0], &m_pCurrent[-HISTORY_ELEMENTS], HISTORY_ELEMENTS * sizeof(TYPE));
m_pCurrent = &m_pData[HISTORY_ELEMENTS];
}
__inline void IncrementSafe()
{
m_pCurrent++;
if (m_pCurrent == &m_pData[WINDOW_ELEMENTS + HISTORY_ELEMENTS])
Roll();
}
__inline void IncrementFast()
{
m_pCurrent++;
}
__inline TYPE & operator[](const int nIndex) const
{
return m_pCurrent[nIndex];
}
protected:
TYPE * m_pData;
TYPE * m_pCurrent;
};
#endif // #ifndef APE_ROLLBUFFER_H
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