Method push_back

ext/include/cppformat/format.h:280–284

  void clear() FMT_NOEXCEPT(true) { size_ = 0; }

  void push_back(const T &value) {
    if (size_ == capacity_)
      grow(size_ + 1);
    ptr_[size_++] = value;
  }

  // Appends data to the end of the buffer.
  void append(const T *begin, const T *end);