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std::ios_base::iword

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< cpp‎ | io‎ | ios base

 
 
Entrada / salida de la biblioteca
I / O manipuladores
C-estilo I / O
Buffers
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Buffers
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(obsoleto)
Arroyos
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Streams
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Abstracciones
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Abstractions
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File I / O
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File I/O
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Cadena de I / O
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String I/O
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Matriz I / O
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Array I/O
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(obsoleto)
(obsoleto)
(obsoleto)
Tipos
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Types
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Error interfaz categoría
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Error category interface
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(C++11)
 
std::ios_base
Las funciones miembro
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Member functions
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Formato
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Formatting
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Locales
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Locales
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Conjunto extensible interior
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Internal extensible array
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ios_base::iword
Varios
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Miscellaneous
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Clases de miembros
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Member classes
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Tipos de miembros
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Member types
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long& iword( int index );
En primer lugar, asigna o cambia el tamaño del almacenamiento privado (matriz dinámica de long u otra estructura de datos indexable) lo suficiente para hacer index un índice válido, devuelve una referencia al elemento long del almacenamiento privado con el índice index .
Original:
First, allocates or resizes the private storage (dynamic array of long or another indexable data structure) sufficiently to make index a valid index, then returns a reference to the long element of the private storage with the index index.
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La referencia puede ser invalidado por cualquier operación en este objeto ios_base, incluyendo otra llamada a iword(), pero los valores almacenados se mantienen, por lo que la lectura de iword(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 0 .
Original:
The reference may be invalidated by any operation on this ios_base object, including another call to iword(), but the stored values are retained, so that reading from iword(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 0.
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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
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Contenido

[editar] Notas

El uso típico de almacenamiento iword es transmitir información (por ejemplo, banderas de formato personalizadas) definidas por el usuario de E / S para los manipuladores definidos por el usuario y operator<< operator>> o definida por el usuario facetas de formato imbuidos en flujos estándares .
Original:
Typical use of iword storage is to pass information (e.g. custom formatting flags) from user-defined I/O manipulators to user-defined operator<< and operator>> or to user-defined formatting facets imbued into standard streams.
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[editar] Parámetros

index -
índice de valor del elemento
Original:
index value of the element
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[editar] Valor de retorno

referencia al elemento
Original:
reference to the element
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[editar] Excepciones

Puede lanzar std::ios_base::failure al ajustar el badbit .
Original:
May throw std::ios_base::failure when setting the badbit.
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[editar] Ejemplo

#include <iostream>
#include <string>
 
struct Foo {
    static int foo_xalloc;
    std::string data; 
    Foo(const std::string& s) : data(s) {}
};
 
// allocates the iword storage for use with Foo objects
int Foo::foo_xalloc = std::ios_base::xalloc();
 
// This user-defined operator<< prints the string in reverse if the iword holds 1
std::ostream& operator<<(std::ostream& os, Foo& f)
{
    if(os.iword(Foo::foo_xalloc) == 1)
        return os << std::string(f.data.rbegin(), f.data.rend());
    else
        return os << f.data;
}
 
// This I/O manipulator flips the number stored in iword between 0 and 1
std::ios_base& rev(std::ios_base& os)
{
    os.iword(Foo::foo_xalloc) = !os.iword(Foo::foo_xalloc);
    return os;
}
 
int main()
{
    Foo f("example");
    std::cout << f << '\n' << rev << f << '\n' << rev << f << '\n';
}

Salida:

example
elpmaxe
example

[editar] Ver también

cambia el tamaño del almacenamiento privado si es necesario y el acceso a la void* elemento en el índice especificado
Original:
resizes the private storage if necessary and access to the void* element at the given index
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(función miembro público) [editar]
[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()
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(función miembro público estático) [editar]