Espacios de nombres
Variantes
Acciones

std::ios_base::pword

De cppreference.com
< cpp‎ | io‎ | ios base

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
Original:
Buffers
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(obsoleto)
Arroyos
Original:
Streams
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Abstracciones
Original:
Abstractions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_ifstream
basic_ofstream
basic_fstream
Cadena de I / O
Original:
String I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
basic_istringstream
basic_ostringstream
basic_stringstream
Matriz I / O
Original:
Array I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
istrstream(obsoleto)
ostrstream(obsoleto)
strstream(obsoleto)
Tipos
Original:
Types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
streamoff
streamsize
fpos
Error interfaz categoría
Original:
Error category interface
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
iostream_category(C++11)
io_errc(C++11)
 
std::ios_base
Las funciones miembro
Original:
Member functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::ios_base
ios_base::~ios_base
Formato
Original:
Formatting
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
Locales
Original:
Locales
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::imbue
ios_base::getloc
Conjunto extensible interior
Original:
Internal extensible array
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::xalloc
ios_base::iword
ios_base::pword
Varios
Original:
Miscellaneous
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::register_callback
ios_base::sync_with_stdio
Clases de miembros
Original:
Member classes
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::failure
ios_base::Init
Tipos de miembros
Original:
Member types
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
ios_base::openmode
ios_base::fmtflags
ios_base::iostate
ios_base::seekdir
ios_base::event
ios_base::event_callback
 
void*& pword( int index );
En primer lugar, asigna o cambia el tamaño del almacenamiento privado (matriz dinámica de void* u otra estructura de datos indexable) lo suficiente para hacer index un índice válido, devuelve una referencia al elemento void* del almacenamiento privado con el índice index .
Original:
First, allocates or resizes the private storage (dynamic array of void* or another indexable data structure) sufficiently to make index a valid index, then returns a reference to the void* element of the private storage with the index index.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
La referencia puede ser invalidado por cualquier operación en este objeto ios_base, incluyendo otra llamada a pword(), pero los valores almacenados se mantienen, por lo que la lectura de pword(index) con el mismo índice después producirá el mismo valor (hasta la siguiente llamada a copyfmt()). El valor puede ser utilizado para cualquier propósito. El índice del elemento debe ser obtenido por xalloc(), de lo contrario las colisiones con otros usuarios de este ios_base puede ocurrir. Los nuevos elementos se inicializan en NULL .
Original:
The reference may be invalidated by any operation on this ios_base object, including another call to pword(), but the stored values are retained, so that reading from pword(index) with the same index later will produce the same value (until the next call to copyfmt()). The value can be used for any purpose. The index of the element must be obtained by xalloc(), otherwise collisions with other users of this ios_base may occur. New elements are initialized to NULL.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Si la asignación de falla, llama std::basic_ios<>::setstate(badbit) que puede std::basic_ios::failure tiro
Original:
If allocation fails, calls std::basic_ios<>::setstate(badbit) which may throw std::basic_ios::failure
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Contenido

[editar] Parámetros

index -
índice de valor del elemento
Original:
index value of the element
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Valor de retorno

referencia al elemento
Original:
reference to the element
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Excepciones

Puede lanzar std::ios_base::failure al ajustar el badbit .
Original:
May throw std::ios_base::failure when setting the badbit.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[editar] Ejemplo

[edit]

Utiliza la base de clase de almacenamiento pword para la identificación de tipo en tiempo de ejecución de objetos de flujo derivados .
Original:
Uses base class pword storage for runtime type identification of derived stream objects.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
 
template<class charT, class traits = std::char_traits<charT> >
class mystream : public std::basic_ostream<charT, traits>
{
 public:
    static const int xindex;
    mystream(std::basic_ostream<charT, traits>& ostr) :
        std::basic_ostream<charT, traits>(ostr.rdbuf())
    {
         this->pword(xindex) = this;
    }
 
    void myfn()
    {
        *this << "[special handling for mystream]";
    }
};
 
// each specialization of mystream obtains a unique index from xalloc()
template<class charT, class traits>
const int mystream<charT, traits>::xindex = std::ios_base::xalloc();
 
// This I/O manipulator will be able to recognize ostreams that are mystreams
// by looking up the pointer stored in pword
template<class charT, class traits>
std::basic_ostream<charT,traits>& mymanip(std::basic_ostream<charT,traits>& os)
{
 if (os.pword(mystream<charT,traits>::xindex) == &os) 
    static_cast<mystream<charT,traits>&>(os).myfn();
 return os;
}
 
int main()
{
    std::cout << "cout, narrow-character test " << mymanip << '\n';
 
    mystream<char> myout(std::cout);
    myout << "myout, narrow-character test " << mymanip << '\n';
 
    std::wcout << "wcout, wide-character test " << mymanip << '\n';
 
    mystream<wchar_t> mywout(std::wcout);
    mywout << "mywout, wide-character test " << mymanip << '\n';
}

Output:

cout, narrow-character test 
myout, narrow-character test [special handling for mystream]
wcout, wide-character test 
mywout, wide-character test [special handling for mystream]

[editar] Ver también

cambia el tamaño del almacenamiento privado si es necesario y el acceso a la long elemento en el índice especificado
Original:
resizes the private storage if necessary and access to the long element at the given index
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(miembro público función) [edit]
[estático]
devuelve un entero único para todo el programa que es seguro de usar como índice para pword () y iword ()
Original:
returns a program-wide unique integer that is safe to use as index to pword() and iword()
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(miembro estático público función) [edit]