중복 코드 제거 기법 - swith+for 코드 점프 기법

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이 포스트의 준비물

• Mozila Firefox 4
  
• boost 1.45.0

참조 문헌

• \boost_1_45_0\boost\asio\impl\write.hpp:130 ~ 152 라인
  

맛보기 코드
template <typename AsyncWriteStream, typename ConstBufferSequence, typename CompletionCondition, typename WriteHandler> class write_op : detail::base_from_completion_cond<CompletionCondition> { public: write_op(AsyncWriteStream& stream, const ConstBufferSequence& buffers, CompletionCondition completion_condition, WriteHandler handler) : detail::base_from_completion_cond< CompletionCondition>(completion_condition), stream_(stream), buffers_(buffers), total_transferred_(0), handler_(handler) { } void operator()(const boost::system::error_code& ec, std::size_t bytes_transferred, int start = 0) { switch (start) { case 1: buffers_.prepare(this->check_for_completion(ec, total_transferred_)); for (;;) { stream_.async_write_some(buffers_, *this); return; default: total_transferred_ += bytes_transferred; buffers_.consume(bytes_transferred); buffers_.prepare(this->check_for_completion(ec, total_transferred_)); if ((!ec && bytes_transferred == 0) || buffers_.begin() == buffers_.end()) break; } handler_(ec, static_cast<const std::size_t&>(total_transferred_)); } }

여담

• goto 만 안썻을 뿐이지, switch+for 로 goto 처럼 썻다.
  

:wq!