allocators.h

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#ifndef NPSTAT_ALLOCATORS_HH_
#define NPSTAT_ALLOCATORS_HH_

#include <cassert>

namespace npstat {
    template <typename T>
    inline T* makeBuffer(unsigned sizeNeeded, T* stackBuffer,
                         unsigned sizeofStackBuffer)
    {
        if (sizeNeeded > sizeofStackBuffer || stackBuffer == 0)
            return new T[sizeNeeded];
        else
            return stackBuffer;
    }

    template <typename T>
    inline void destroyBuffer(T* thisBuffer, const T* stackBuffer)
    {
        if (thisBuffer != stackBuffer)
            delete [] thisBuffer;
    }

    template <typename T1, typename T2>
    inline void copyBuffer(T1* dest, const T2* source, const unsigned long len)
    {
        if (len)
        {
            assert(dest);
            assert(source);
            for (unsigned long i=0; i<len; ++i)
                *dest++ = static_cast<T1>(*source++);
        }
    }

    template <typename T>
    inline void clearBuffer(T* buf, const unsigned long len)
    {
        if (len)
        {
            assert(buf);
            const T zero = T();
            for (unsigned long i=0; i<len; ++i)
                *buf++ = zero;
        }
    }
}

#endif // NPSTAT_ALLOCATORS_HH_