Method Reserve

util/stream/str.h:89–91

* @param size Number of additional characters to * reserve in output string. */

     *                                  reserve in output string.
     */
    inline void Reserve(size_t size) {
        S_->reserve(S_->size() + size);
    }

    inline void Swap(TStringOutput& s) noexcept {
        DoSwap(S_, s.S_);