what is the concept behind cout object?

[vw4x4]

what is the concept behind cout object and also insertion operator ?

[Need4Sleep]

that is one hell of a broad question you have there

[TheIdeasMan]

Google Google Google Google Google

[viliml]

For the first I don't know, buti do know the answer to the second question. Just wait until I get on my laptop (I'm on a cellphone right now)

[viliml]

OK, this is the code for the M_insert function, that all insertion operators use:

  template<typename _CharT, typename _Traits>
    template<typename _ValueT>
      basic_ostream<_CharT, _Traits>&
      basic_ostream<_CharT, _Traits>::
      _M_insert(_ValueT __v)
      {
	sentry __cerb(*this);//the sentry is a class that's used for chacking for I/O errors
	if (__cerb)//every thing is OK
	  {
	    ios_base::iostate __err = ios_base::goodbit;//good untill proved bad
	    try
	      {
		const __num_put_type& __np = __check_facet(this->_M_num_put); //the locale facet's number put
		if (__np.put(*this, *this, this->fill(), __v).failed())//if failed
		  __err |= ios_base::badbit;//it's bad
	      }
	    catch(__cxxabiv1::__forced_unwind&)//dunno
	      {
		this->_M_setstate(ios_base::badbit);//bad	
		__throw_exception_again;//throw exception
	      }
	    catch(...)
	      { this->_M_setstate(ios_base::badbit); }//bad
	    if (__err)
	      this->setstate(__err);//error
	  }
	return *this;
      }

[kbw]

It's been previously recommended you read Wikipedia's description of streams. Have you done that? There's just too much to say about streams, and it's all pretty much there.