C++ iosfwd 头

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  定义

  iosfwd 头提供了标准输入/输出库类型的前向声明。请注意，该文件不包含模板定义，因此应仅包含在其他标头中以提供这些类型的前向声明。
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  源代码C++ 98

  
  namespace std {
    template<class charT> struct char_traits;
    template<> class char_traits<char>;
    template<> class char_traits<wchar_t>;
  
    template<class T> class allocator;
  
    template <class charT, class traits=char_traits<charT> > class basic_ios;
    template <class charT, class traits=char_traits<charT> > class basic_streambuf;
    template <class charT, class traits=char_traits<charT> > class basic_istream;
    template <class charT, class traits=char_traits<charT> > class basic_ostream;
    template <class charT, class traits=char_traits<charT> > class basic_iostream;
   
   template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> >
      class basic_stringbuf;
    template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> > 
      class basic_istringstream;
    template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> >
      class basic_ostringstream;
    template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> >
      class basic_stringstream;
  
    template <class charT, class traits=char_traits<charT> > class basic_filebuf;
    template <class charT, class traits=char_traits<charT> > class basic_ifstream;
    template <class charT, class traits=char_traits<charT> > class basic_ofstream;
    template <class charT, class traits=char_traits<charT> > class basic_fstream;
  
    template <class charT, class traits=char_traits<charT> > class istreambuf_iterator;
    template <class charT, class traits=char_traits<charT> > class ostreambuf_iterator;
  
    template<class stateT> class fpos;
  
    typedef basic_ios<char>              ios;
    typedef basic_streambuf<char>        streambuf;
    typedef basic_istream<char>          istream;
    typedef basic_ostream<char>          ostream;
    typedef basic_iostream<char>         iostream;
    typedef basic_stringbuf<char>        stringbuf;
    typedef basic_istringstream<char>    istringstream;
    typedef basic_ostringstream<char>    ostringstream;
    typedef basic_stringstream<char>     stringstream;
    typedef basic_filebuf<char>          filebuf;
    typedef basic_ifstream<char>         ifstream;
    typedef basic_ofstream<char>         ofstream;
    typedef basic_fstream<char>          fstream;
  
    typedef basic_ios<wchar_t>           wios;
    typedef basic_streambuf<wchar_t>     wstreambuf;
    typedef basic_istream<wchar_t>       wistream;
    typedef basic_ostream<wchar_t>       wostream;
    typedef basic_iostream<wchar_t>      wiostream;
    typedef basic_stringbuf<wchar_t>     wstringbuf;
    typedef basic_istringstream<wchar_t> wistringstream;
    typedef basic_ostringstream<wchar_t> wostringstream;
    typedef basic_stringstream<wchar_t>  wstringstream;
    typedef basic_filebuf<wchar_t>       wfilebuf;
    typedef basic_ifstream<wchar_t>      wifstream;
    typedef basic_ofstream<wchar_t>      wofstream;
    typedef basic_fstream<wchar_t>       wfstream;
  
    typedef fpos<mbstate_t> streampos;
    typedef fpos<mbstate_t> wstreampos;
  }
  

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  源代码C++ 11

  
  namespace std {
    template<class charT> struct char_traits;
    template<> class char_traits<char>;
    template<> class char_traits<char16_t>;
    template<> class char_traits<char32_t>;
    template<> class char_traits<wchar_t>;
  
    template<class T> class allocator;
  
    template <class charT, class traits=char_traits<charT> > class basic_ios;
    template <class charT, class traits=char_traits<charT> > class basic_streambuf;
    template <class charT, class traits=char_traits<charT> > class basic_istream;
    template <class charT, class traits=char_traits<charT> > class basic_ostream;
    template <class charT, class traits=char_traits<charT> > class basic_iostream;
   
   template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> >
      class basic_stringbuf;
    template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> > 
      class basic_istringstream;
    template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> >
      class basic_ostringstream;
    template <class charT, class traits=char_traits<charT>, class Alloc=allocator<charT> >
      class basic_stringstream;
  
    template <class charT, class traits=char_traits<charT> > class basic_filebuf;
    template <class charT, class traits=char_traits<charT> > class basic_ifstream;
    template <class charT, class traits=char_traits<charT> > class basic_ofstream;
    template <class charT, class traits=char_traits<charT> > class basic_fstream;
  
    template <class charT, class traits=char_traits<charT> > class istreambuf_iterator;
    template <class charT, class traits=char_traits<charT> > class ostreambuf_iterator;
  
    template<class stateT> class fpos;
  
    typedef basic_ios<char>              ios;
    typedef basic_streambuf<char>        streambuf;
    typedef basic_istream<char>          istream;
    typedef basic_ostream<char>          ostream;
    typedef basic_iostream<char>         iostream;
    typedef basic_stringbuf<char>        stringbuf;
    typedef basic_istringstream<char>    istringstream;
    typedef basic_ostringstream<char>    ostringstream;
    typedef basic_stringstream<char>     stringstream;
    typedef basic_filebuf<char>          filebuf;
    typedef basic_ifstream<char>         ifstream;
    typedef basic_ofstream<char>         ofstream;
    typedef basic_fstream<char>          fstream;
  
    typedef basic_ios<wchar_t>           wios;
    typedef basic_streambuf<wchar_t>     wstreambuf;
    typedef basic_istream<wchar_t>       wistream;
    typedef basic_ostream<wchar_t>       wostream;
    typedef basic_iostream<wchar_t>      wiostream;
    typedef basic_stringbuf<wchar_t>     wstringbuf;
    typedef basic_istringstream<wchar_t> wistringstream;
    typedef basic_ostringstream<wchar_t> wostringstream;
    typedef basic_stringstream<wchar_t>  wstringstream;
    typedef basic_filebuf<wchar_t>       wfilebuf;
    typedef basic_ifstream<wchar_t>      wifstream;
    typedef basic_ofstream<wchar_t>      wofstream;
    typedef basic_fstream<wchar_t>       wfstream;
  
    typedef fpos<mbstate_t> streampos;
    typedef fpos<mbstate_t> wstreampos;
  }
  

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