class LogStreamBuf : public std::streambuf {　　public:　　// REQUIREMENTS: "len" must be >= 2 to account for the ‘\n‘ and ‘\n‘.　　LogStreamBuf(char *buf, int len) {　　　　setp(buf, buf + len - 2);　　}　　// This effectively ignores overflow.　　virtual int_type overflow(int_type ch) {　　　　return ch;　　}　　// Legacy public ostrstream method.　　size_t pcount() const { return pptr() - pbase(); }　　char* pbase() const { return std::streambuf::pbase(); }};

class LogStream : public std::ostream {   public:    　　LogStream(char *buf, int len, int ctr)        　　: std::ostream(NULL),          　　streambuf_(buf, len),          　　ctr_(ctr),          　　self_(this) { rdbuf(&streambuf_);}    　　int ctr() const { return ctr_; }    　　void set_ctr(int ctr) { ctr_ = ctr; }    　　LogStream* self() const { return self_; }    　　// Legacy std::streambuf methods.    　　size_t pcount() const { return streambuf_.pcount(); }   　　 char* pbase() const { return streambuf_.pbase(); }   　　 char* str() const { return pbase(); }  private:   　　 base_logging::LogStreamBuf streambuf_;    　　int ctr_;  // Counter hack (for the LOG_EVERY_X() macro)    　　LogStream *self_;  // Consistency check hack  };