友元重荷
ostream operator<
VS2010 :
c:\ \visualstudio\vc\include\ostream(604): error C2248: “std::basic_ios<_elem>::basic_ios”: private ( “std::basic_ios<_elem>” )
1> with
1> [
1> _Elem=char,
1> _Traits=std::char_traits
1> ]
, , 。
IO , 。