std::set_new_handler
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| definiert in Header <new>
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| std::new_handler set_new_handler(std::new_handler new_p) |
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Macht
new_p die neue globale new-Handler-Funktion und gibt den zuvor installierten new-Handler .Original:
Makes
new_p the new global new-handler function and returns the previously installed new-handler.The text has been machine-translated via Google Translate.
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Inhaltsverzeichnis |
[Bearbeiten] Notes
Das new-Handler ist die Funktion von <div class="t-tr-text">Zuordnungsfunktionen
aufgerufen, wenn eine Speicherzuweisung fehlschlägt. Seine Zweckbestimmung ist eines von drei Dingen:Original:
allocation functions
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Original:
The new-handler function is the function called by
Zuordnungsfunktionen</div> whenever a memory allocation attempt fails. Its intended purpose is one of three things:
Original:
allocation functions
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mehr Arbeitsspeicher zur Verfügung
2) Original:
make more memory available
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beenden Sie das Programm (z. B. durch Berufung std::terminate)
3) Original:
terminate the program (e.g. by calling std::terminate)
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werfen Ausnahme des Typs std::bad_alloc oder aus std::bad_alloc
Original:
throw exception of type std::bad_alloc or derived from std::bad_alloc
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Wenn new-Handler kehrt wiederholt die Zuweisung Funktion die zuvor gescheitert Allokation Versuch und ruft die new-Handler wieder, wenn die Zuordnung erneut fehlschlägt. Um die Schleife zu beenden, new-Handler nennen std::set_new_handler(nullptr): wenn nach einer fehlgeschlagenen Allokation Versuch findet Allocation-Funktion, die std::get_new_handler eine Null-Zeiger-Wert zurückgibt, wird es std::bad_alloc werfen .
Original:
If new-handler returns, the allocation function repeats the previously-failed allocation attempt and calls the new-handler again if the allocation fails again. To end the loop, new-handler may call std::set_new_handler(nullptr): if, after a failed allocation attempt, allocation function finds that std::get_new_handler returns a null pointer value, it will throw std::bad_alloc.
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Beim Programmstart, new-Handler ist ein NULL-Zeiger .
Original:
At program startup, new-handler is a null pointer.
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[Bearbeiten] Parameter
| new_p | - | Zeiger vom Typ std::new_handler oder Null-Zeiger funktionieren
Original: pointer to function of type std::new_handler, or null pointer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[Bearbeiten] Rückgabewert
Die vorher installierten neuen Handler oder eine Null-Zeiger-Wert, wenn keiner installiert wurde .
Original:
The previously-installed new handler, or a null pointer value if none was installed.
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[Bearbeiten] Ausnahmen
[Bearbeiten] Beispiel
#include <iostream> #include <new> void handler() { std::cout << "Memory allocation failed, terminating\n"; std::set_new_handler(nullptr); } int main() { std::set_new_handler(handler); try { while(true) new int[100000000ul]; }catch(const std::bad_alloc& e) { std::cout << e.what() << '\n'; } }
Output:
Memory allocation failed, terminating std::bad_alloc
[Bearbeiten] Siehe auch
| Speicheranforderungsfunktion (Funktion) | |
| set_new_handler |
registriert einen neuen Funktionszeiger auf die Allokationsfunktion (Funktion) |
| Typ des Funktionszeiger für new (typedef) | |
| Ausnahme bei Fehlschlag der Speicherzuweisung (Klasse) | |
