UT/UT_StackBuffer.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Edward Lam
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        UT_StackBuffer.h (C++)
 *
 * COMMENTS:    A special buffer class that allocates from the stack if
 *              below the given threshold.
 *
 */

#ifndef __UT_StackBuffer_h__
#define __UT_StackBuffer_h__

template <typename T, size_t THRESHOLD> 
class UT_StackBuffer
{
public:
    UT_StackBuffer(size_t num_elems)
    {
        if (num_elems <= THRESHOLD)
            myData = myBuffer;
        else
            myData = new T[num_elems];
    }
    ~UT_StackBuffer()
    {
        if (myData != myBuffer)
            delete [] myData;
    }

    operator T *()
    {
        return myData;
    }
    operator const T *() const
    {
        return (const T *)myData;
    }

private:
    T   myBuffer[THRESHOLD];
    T * myData;
};

#endif // __UT_StackBuffer_h__

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