共用方式為


<iosfwd>

宣告為幾個樣板類別的向前參考用於 iostreams 中。 所有這類樣板類別在其他標準標頭中定義。 將這個標頭明確,只有在您需要宣告的其中之一時,不過,沒有它的定義。

#include <iosfwd>

Typedef

typedef T1 streamoff;
typedef T2 streamsize;
typedef fpos streampos;

// wchar_t TYPE DEFINITIONS
typedef basic_ios<char, char_traits<char> > ios;
typedef basic_streambuf<char, char_traits<char> > streambuf;
typedef basic_istream<char, char_traits<char> > istream;
typedef basic_ostream<char, char_traits<char> > ostream;
typedef basic_iostream<char, char_traits<char> > iostream;
typedef basic_stringbuf<char, char_traits<char> > stringbuf;
typedef basic_istringstream<char, char_traits<char> > istringstream;
typedef basic_ostringstream<char, char_traits<char> > ostringstream;
typedef basic_stringstream<char, char_traits<char> > stringstream;
typedef basic_filebuf<char, char_traits<char> > filebuf;
typedef basic_ifstream<char, char_traits<char> > ifstream;
typedef basic_ofstream<char, char_traits<char> > ofstream;
typedef basic_fstream<char, char_traits<char> > fstream;

// wchar_t TYPE DEFINITIONS
typedef basic_ios<wchar_t, char_traits<wchar_t> > wios;
typedef basic_streambuf<wchar_t, char_traits<wchar_t> > wstreambuf;
typedef basic_istream<wchar_t, char_traits<wchar_t> > wistream;
typedef basic_ostream<wchar_t, char_traits<wchar_t> > wostream;
typedef basic_iostream<wchar_t, char_traits<wchar_t> > wiostream;
typedef basic_stringbuf<wchar_t, char_traits<wchar_t> > wstringbuf;
typedef basic_istringstream<wchar_t, char_traits<wchar_t> > wistringstream;
typedef basic_ostringstream<wchar_t, char_traits<wchar_t> > wostringstream;
typedef basic_stringstream<wchar_t, char_traits<wchar_t> > wstringstream;
typedef basic_filebuf<wchar_t, char_traits<wchar_t> > wfilebuf;
typedef basic_ifstream<wchar_t, char_traits<wchar_t> > wifstream;
typedef basic_ofstream<wchar_t, char_traits<wchar_t> > wofstream;
typedef basic_fstream<wchar_t, char_traits<wchar_t> > wfstream;
};

向前宣告/樣板類別

template<class _Statetype>
class fpos;

template<class Elem>;
class char_traits;

class char_traits<char>;

class char_traits<wchar_t>;

template<class _Ty>
class allocator;

class ios_base;

template<class Elem, class Tr = char_traits<Elem> >
class basic_ios;

template<class Elem, class Tr = char_traits<Elem> >
class istreambuf_iterator;

template<class Elem, class Tr = char_traits<Elem> >
class ostreambuf_iterator;

template<class Elem, class Tr = char_traits<Elem> >
class basic_streambuf;

template<class Elem, class Tr = char_traits<Elem> >
class basic_istream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_ostream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_iostream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_stringbuf;

template<class Elem, class Tr = char_traits<Elem> >
class basic_istringstream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_ostringstream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_stringstream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_filebuf;

template<class Elem, class Tr = char_traits<Elem> >
class basic_ifstream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_ofstream;

template<class Elem, class Tr = char_traits<Elem> >
class basic_fstream;

請參閱

參考

C++ 標準程式庫中的執行緒安全

iostream 程式設計

iostreams 慣例

其他資源

C++ 標準程式庫標頭檔