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std::set_new_handler

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< cpp‎ | memory‎ | new

 
 
 
Dynamische Speicherverwaltung
Low-Level-Speicherverwaltung
Zuweiser
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Allocators
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allocator
allocator_traits(C++11)
allocator_arg_t(C++11)
allocator_arg(C++11)
uses_allocator(C++11)
scoped_allocator_adaptor(C++11)
Initialisierter Speicher
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n(C++11)
uninitialized_fill
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Intelligente Zeiger
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(veraltet)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
Garbage Collection Unterstützung
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Garbage collection support
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declare_reachable(C++11)
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Miscellaneous
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pointer_traits(C++11)
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Low-Level-Speicherverwaltung
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Functions
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operator new
operator new[]
operator delete
operator delete[]
get_new_handler(C++11)
set_new_handler
Classes
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Classes
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bad_alloc
bad_array_new_length(C++11)
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Types
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Types
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new_handler
Objects
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Objects
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nothrow
 
Defined in header <new>
std::new_handler set_new_handler(std::new_handler new_p)
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.
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Inhaltsverzeichnis

[Bearbeiten] Notes

aufgerufen, wenn eine Speicherzuweisung fehlschlägt. Seine Zweckbestimmung ist eines von drei Dingen:
Original:
The new-handler function is the function called by
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1)
mehr Arbeitsspeicher zur Verfügung
Original:
make more memory available
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2)
beenden Sie das Programm (z. B. durch Berufung std::terminate)
Original:
terminate the program (e.g. by calling std::terminate)
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3)
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
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[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

noexcept specification:  
noexcept
  (seit C++11)

[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

Zuordnungsfunktionen
Original:
allocation functions
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(Funktion) [edit]
set_new_handler
registriert einen neuen Handler
Original:
registers a new handler
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(Funktion) [edit]
Funktionszeiger Typ des neuen Handler
Original:
function pointer type of the new handler
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(typedef) [edit]
Ausnahme ausgelöst, wenn die Speicherzuweisung fehlschlägt
Original:
exception thrown when memory allocation fails
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(Klasse) [edit]