smart buffer for C++11

auto_buffer.h

/// smart buffer for C++11
template<typename T, size_t N=256> class auto_buffer {
  T mSmallBuf[N];
  T* mBuf = mSmallBuf;
  size_t mHeapSize = 0;
  size_t mBufSize = N;
public:
  auto_buffer() = default;
  auto_buffer(const auto_buffer&) = delete; // no copy
  auto_buffer& operator=(const auto_buffer&) = delete; // no copy
  ~auto_buffer() {
    if (mBuf != mSmallBuf) delete[] mBuf;
  }

  T* oprator()        { return mBuf; }
  size_t size() const { return mBufSize; }

  void reset() {
    if (mBuf != mSmallBuf) delete[] mBuf;
    mBuf = mSmallBuf;
    mHeapSize = 0;
    mBufSize = N;
  }
  bool resize(size_t n) { ///< resize buffer. buffered data is not kept.
    if (n <= N || n <= mHeapSize) { mBufSize = n; return true; }
    T* p = new T[n];
    if (!p) { reset(); return false; }
    if (mBuf != mSmallBuf) delete[] mBuf;
    mBuf = p;
    mBufSize = mHeapSize = n;
    return true;
  }
};