Method grow

include/fmt/base.h:2058–2062

  size_t count_ = 0;

  static FMT_CONSTEXPR void grow(buffer<T>& buf, size_t) {
    if (buf.size() != buffer_size) return;
    static_cast<counting_buffer&>(buf).count_ += buf.size();
    buf.clear();
  }

 public:
  constexpr counting_buffer() : buffer<T>(grow, data_, 0, buffer_size) {}