[Fix Size Buffer]manager a simple fix length buffer with smart pointer #cpp #RAII

FixSizeBuffer.cpp

#include <memory>
#include <assert.h>
/**
  * @brief 一个固定长度的buffer
  * @note 用于存储固定长度的数据，不会发生内存的重新分配
  * @author 
  */
class FixSizeBuffer {
public:
  FixSizeBuffer(uint32_t size)
      : data_(std::make_unique<uint8_t[]>(size)),
        len_(size){}
  ~FixSizeBuffer() = default;

  FixSizeBuffer(const FixSizeBuffer &) = delete;
  FixSizeBuffer &operator=(const FixSizeBuffer &) = delete;

  FixSizeBuffer(FixSizeBuffer &&) = default;
  FixSizeBuffer &operator=(FixSizeBuffer &&) = default;

public:
  int length() const { return len_; }

  void copy_data(int offset, const uint8_t *src, int size) {
    assert(offset + size <= len_ );
    data_ = std::make_unique<uint8_t[]>(size);
    std::memcpy(data_.get() + offset, src, size);
  }

  const uint8_t *data() const { return data_.get(); }

private:
  std::unique_ptr<uint8_t[]> data_;
  int len_;
};

int main() {
    FixSizeBuffer key(10);
    uint8_t data[10] = {0,1,2,3,4,5,6,7,8,9};
    key.copy_data(0, data, 10);
    return 0;
}