Method append_2

libhsclient/string_buffer.hpp:99–107

    end_offset += len;
  }
  void append_2(const char *s1, const char *f1, const char *s2,
    const char *f2) {
    const size_t l1 = f1 - s1;
    const size_t l2 = f2 - s2;
    reserve(end_offset + l1 + l2);
    memcpy(buffer + end_offset, s1, l1);
    memcpy(buffer + end_offset + l1, s2, l2);
    end_offset += l1 + l2;
  }
 private:
  char *buffer;
  size_t begin_offset;