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std::ios_base::pword

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< cpp‎ | io‎ | ios base

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
Original:
Streams
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Abstractions
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::ios_base
Les fonctions membres
Original:
Member functions
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ios_base::ios_base
ios_base::~ios_base
Mise en forme
Original:
Formatting
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ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
Locales
Original:
Locales
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ios_base::imbue
ios_base::getloc
Interne gamme extensible
Original:
Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
Divers
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Miscellaneous
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ios_base::register_callback
ios_base::sync_with_stdio
Classes de membres
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Member classes
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ios_base::failure
ios_base::Init
Types de membres
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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
 
void*& pword( int index );
La première, affecte ou redimensionne le stockage privé (tableau dynamique de void* ou une autre structure de données amovible) suffisamment pour faire index un indice valide, puis renvoie une référence à l'élément de void* le stockage privé à l'indice 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.
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La référence peut être invalidé par une opération sur cet objet ios_base, y compris un autre appel à pword(), mais les valeurs enregistrées sont conservées, de sorte que la lecture de pword(index) avec le même indice plus tard, va produire la même valeur (jusqu'à ce que le prochain appel à copyfmt()). La valeur peut être utilisée pour n'importe quel but. L'indice de l'élément doit être obtenu par xalloc(), sinon les collisions avec les autres utilisateurs de ce ios_base peut se produire. De nouveaux éléments sont initialisés à 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.
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Si l'allocation échoue, appelle std::basic_ios<>::setstate(badbit) qui peut std::basic_ios::failure jeter
Original:
If allocation fails, calls std::basic_ios<>::setstate(badbit) which may throw std::basic_ios::failure
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Sommaire

[modifier] Paramètres

index -
valeur de l'indice de l'élément
Original:
index value of the element
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[modifier] Retourne la valeur

une référence à l'élément
Original:
reference to the element
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[modifier] Exceptions

Peut générer std::ios_base::failure lors du réglage du BadBit .
Original:
May throw std::ios_base::failure when setting the badbit.
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[modifier] Exemple

[edit]

Utilise la classe de base motpasse de stockage pour l'identification du type d'exécution d'objets de flux dérivés .
Original:
Uses base class pword storage for runtime type identification of derived stream objects.
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#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';
}

Résultat :

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

[modifier] Voir aussi

redimensionne le stockage privé et le cas échéant un accès à l'élément de long à l'index donné
Original:
resizes the private storage if necessary and access to the long element at the given index
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(fonction membre publique) [edit]
[
statique
Original:
static
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]
renvoie un entier ensemble du programme unique qui est sûr à utiliser comme indice de motpasse () et iword ()
Original:
returns a program-wide unique integer that is safe to use as index to pword() and iword()
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(fonction membre publique statique) [edit]