std::ios_base::xalloc

 

C++

Linguaggio

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Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer 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 (deprecato)

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

Astrazioni 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

String 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

Array 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 (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi 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

Errore categoria interfaccia 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

Membri funzioni 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

Formattazione 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

Versioni locali 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

Interno di matrice estensibile 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

Varie 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

Membri classi 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

Membri tipi 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

 

staticint xalloc();

Restituisce un valore unico (programma-wide) indice che può essere utilizzato per accedere a un long e uno void* elementi l'ammasso privato chiamando iword() e pword(). La chiamata a xalloc non alloca la memoria.

Original:

Returns an unique (program-wide) index value that can be used to access one long and one void* elements in the private storage by calling iword() and pword(). The call to xalloc does not allocate memory.

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Parametri

(Nessuno)

Original:

(none)

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Valore di ritorno

intero univoco per uso come pword / iword index

Original:

unique integer for use as pword/iword index

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Esempio

Utilizza memorizzazione classe base pword per l'identificazione tipo di runtime oggetti flusso derivati ​​.

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 :publicstd::basic_ostream<charT, traits>{public:staticconstint 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>constint 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 pwordtemplate<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]

Vedi anche

pword	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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (metodo pubblico)
iword	ridimensiona l'ammasso privato e, se necessario, l'accesso all'elemento long in corrispondenza dell'indice specificato 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. (metodo pubblico)