关于内存方面的知识,该如何解决

关于内存方面的知识
getline()和cin.getline()在内存中整个实现的过程是怎样的？
getline() 原型：istream& getline( istream& is, string& s, char delimiter = '\n' );
cin.getline原型：cin.getline(string &,LENGTH,char delimiter = '\n' );


[解决办法]
看 stl 源码
[解决办法]

C/C++ code

 
  
  
 template <class _Elem, 
 class _Traits, 
 class _Alloc> inline 
 basic_istream <_Elem, _Traits>& __CLRCALL_OR_CDECL getline( 
 basic_istream <_Elem, _Traits>& _Istr, 
 basic_string <_Elem, _Traits, _Alloc>& _Str, 
 const _Elem _Delim) 
 {// get characters into string, discard delimiter 
 typedef basic_istream <_Elem, _Traits> _Myis; 
 ios_base::iostate _State = ios_base::goodbit; 
 bool _Changed = false; 
 const typename _Myis::sentry _Ok(_Istr, true); 
  
 if (_Ok) 
 {// state okay, extract characters 
 _TRY_IO_BEGIN 
 _Str.erase(); 
 const typename _Traits::int_type _Metadelim = 
 _Traits::to_int_type(_Delim); 
 typename _Traits::int_type _Meta = _Istr.rdbuf()->sgetc(); 
  
 for (; ; _Meta = _Istr.rdbuf()->snextc()) 
 if (_Traits::eq_int_type(_Traits::eof(), _Meta)) 
 {// end of file, quit 
 _State |= ios_base::eofbit; 
 break; 
 } 
 else if (_Traits::eq_int_type(_Meta, _Metadelim)) 
 {// got a delimiter, discard it and quit 
 _Changed = true; 
 _Istr.rdbuf()->sbumpc(); 
 break; 
 } 
 else if (_Str.max_size()  <= _Str.size()) 
 {// string too large, quit 
 _State |= ios_base::failbit; 
 break; 
 } 
 else 
 {// got a character, add it to string 
 _Str += _Traits::to_char_type(_Meta); 
 _Changed = true; 
 } 
 _CATCH_IO_(_Istr) 
 } 
  
 if (!_Changed) 
 _State |= ios_base::failbit; 
 _Istr.setstate(_State); 
 return (_Istr); 
 }