<iosfwd>

Declara referencias adelantadas a varias plantillas de clase usadas en iostreams. Estas plantillas de clase se definen en otros encabezados estándar. Este encabezado se incluye explícitamente solo cuando se necesita una de sus declaraciones, pero no su definición.

Sintaxis

#include <iosfwd>

Typedefs

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

// char 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;

Declaraciones de avance y plantillas de clase

template <class _Statetype>
class fpos;

template <class Elem>;
class char_traits;

class char_traits<char>;

class char_traits<wchar_t>;

template <class T>
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;

Consulte también

Referencia de archivos de encabezado
Seguridad para subprocesos en la biblioteca estándar de C++
Programación con iostream
Convenciones de iostreams