std::ios_base::iword
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long& iword(int index ); | ||
Zunächst ordnet oder die private Lagerhaltung (dynamisches Array von long oder anderen Wendeschneidplatten Datenstruktur) die Größe ausreichend, um
index gültiger Index, kehrt dann einen Verweis auf die long Element der privaten Lagerhaltung mit dem Index 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. The text has been machine-translated via Google Translate.
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Die Referenz kann von jedem Betrieb ungültig auf dieser
ios_base Objekt, einschließlich anderen Aufruf iword(), aber die gespeicherten Werte bleiben erhalten, so dass das Lesen von iword(index) mit dem gleichen Index später den gleichen Wert zu produzieren (bis zum nächsten Aufruf copyfmt()). Der Wert kann für jeden Zweck verwendet werden. Der Index des Elements durch xalloc() muss eingeholt werden, da sonst Kollisionen mit anderen Nutzern dieser ios_base auftreten. Neuen Elemente werden auf 0 initialisiert .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.The text has been machine-translated via Google Translate.
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Wenn Allokation fehlschlägt, ruft std::basic_ios<>::setstate(badbit) die std::basic_ios::failure werfen kann
Original:
If allocation fails, calls std::basic_ios<>::setstate(badbit) which may throw std::basic_ios::failure
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Inhaltsverzeichnis |
[Bearbeiten]Notes
Typischer Einsatz des iword Speicher ist, um Informationen (zB benutzerdefinierte Formatierung flags) aus benutzerdefinierten I / O-Manipulatoren passieren, um benutzerdefinierte
operator<< und operator>> oder benutzerdefinierte Formatierung Facetten in Standard-Streams durchdrungen .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.The text has been machine-translated via Google Translate.
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[Bearbeiten]Parameter
| index | - | Indexwert des Elements 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. |
[Bearbeiten]Rückgabewert
Verweis auf das Element
Original:
reference to the element
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[Bearbeiten]Ausnahmen
Kann std::ios_base::failure werfen beim Einstellen der badbit .
Original:
May throw std::ios_base::failure when setting the badbit.
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[Bearbeiten]Beispiel
#include <iostream>#include <string> struct Foo {staticint foo_xalloc;std::string data; Foo(conststd::string& s): data(s){}}; // allocates the iword storage for use with Foo objectsint Foo::foo_xalloc= std::ios_base::xalloc(); // This user-defined operator<< prints the string in reverse if the iword holds 1std::ostream& operator<<(std::ostream& os, Foo& f){if(os.iword(Foo::foo_xalloc)==1)return os <<std::string(f.data.rbegin(), f.data.rend());elsereturn os << f.data;} // This I/O manipulator flips the number stored in iword between 0 and 1std::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
[Bearbeiten]Siehe auch
die Größe der privaten Lagerhaltung bei Bedarf und Zugang zum void* Element am angegebenen Index 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. (öffentliche Elementfunktion) | |
[statisch] | kehrt ein Programm-weit eindeutige Zahl, die sicher als Index PWord () und iword () verwenden 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. (public static Elementfunktion) |
