Namespace
Varianti

std::ios_base::iword

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< cpp‎ | io‎ | ios base

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::ios_base
Membri funzioni
Original:
Member functions
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ios_base::ios_base
ios_base::~ios_base
Formattazione
Original:
Formatting
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ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
Versioni locali
Original:
Locales
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ios_base::imbue
ios_base::getloc
Interno di matrice estensibile
Original:
Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
Varie
Original:
Miscellaneous
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ios_base::register_callback
ios_base::sync_with_stdio
Membri classi
Original:
Member classes
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ios_base::failure
ios_base::Init
Membri tipi
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Member types
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ios_base::openmode
ios_base::fmtflags
ios_base::iostate
ios_base::seekdir
ios_base::event
ios_base::event_callback
 
long& iword( int index );
In primo luogo, assegna o ridimensiona l'ammasso privato (matrice dinamica di long o un'altra struttura dati indicizzabili) sufficiente a rendere index un indice valido, quindi restituisce un riferimento all'elemento long all'ammasso privato con l'indice 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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Il riferimento può essere invalidata da qualsiasi operazione su questo oggetto ios_base, tra cui un'altra chiamata a iword(), ma i valori memorizzati vengono conservati, in modo che la lettura dal iword(index) con lo stesso indice in seguito produrrà lo stesso valore (fino alla successiva chiamata a copyfmt()). Il valore può essere utilizzato per qualsiasi scopo. L'indice dell'elemento deve essere ottenuta con xalloc(), altrimenti collisioni con altri utenti di questo ios_base si può verificare. I nuovi elementi vengono inizializzati 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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Se l'allocazione non riesce, chiama std::basic_ios<>::setstate(badbit) che può 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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Indice

[modifica] Note

Uso tipico di stoccaggio iword è quello di passare le informazioni (ad esempio, le bandiere di formattazione personalizzate) definiti dall'utente I / O manipolatori di definito dall'utente operator<< e operator>> o definito dall'utente sfaccettature formattazione imbevuti in flussi standard.
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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[modifica] Parametri

index -
valore di indice dell'elemento
Original:
index value of the element
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[modifica] Valore di ritorno

riferimento all'elemento
Original:
reference to the element
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[modifica] Eccezioni

Può lanciare std::ios_base::failure quando si imposta il badbit.
Original:
May throw std::ios_base::failure when setting the badbit.
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[modifica] Esempio

#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';
}

Output:

example
elpmaxe
example

[modifica] Vedi anche

ridimensiona l'ammasso privato e, se necessario, l'accesso all'elemento void* in corrispondenza dell'indice specificato
Original:
resizes the private storage if necessary and access to the void* element at the given index
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(membro pubblico funzione) [edit]
[statico]
restituisce un programma a livello di intero univoco che è sicuro da usare come indice per pword () e iword ()
Original:
returns a program-wide unique integer that is safe to use as index to pword() and iword()
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(public static membro funzione) [edit]