24   explicit CacheWriteBuffer(const size_t size) : size_(size), pos_(0) {  in CacheWriteBuffer()
26     assert(!pos_);  in CacheWriteBuffer()
33     assert(pos_ + size <= size_);  in Append()
34     memcpy(buf_.get() + pos_, buf, size);  in Append()
35     pos_ += size;  in Append()
36     assert(pos_ <= size_);  in Append()
40     assert(pos_ <= size_);  in FillTrailingZeros()
41     memset(buf_.get() + pos_, '0', size_ - pos_);  in FillTrailingZeros()
42     pos_ = size_;  in FillTrailingZeros()
45   void Reset() { pos_ = 0; }  in Reset()
46   size_t Free() const { return size_ - pos_; }  in Free()
48   size_t Used() const { return pos_; }  in Used()
54   size_t pos_;  variable