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std::set_new_handler

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< cpp | memory | new

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C++
 
Bibliothèque d'utilitaires
 
La gestion dynamique de la mémoire
Faible niveau de gestion de la mémoire
Répartiteurs
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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)
Non initialisée stockage
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Uninitialized storage
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uninitialized_copy
uninitialized_copy_n (C++11)
uninitialized_fill
uninitialized_fill_n
raw_storage_iterator
get_temporary_buffer
return_temporary_buffer
Pointeurs intelligents
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Smart pointers
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unique_ptr (C++11)
shared_ptr (C++11)
weak_ptr (C++11)
auto_ptr (obsolète)
owner_less (C++11)
enable_shared_from_this (C++11)
bad_weak_ptr (C++11)
default_delete (C++11)
Soutien garbage collection
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Garbage collection support
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declare_reachable (C++11)
undeclare_reachable (C++11)
declare_no_pointers (C++11)
undeclare_no_pointers (C++11)
pointer_safety (C++11)
get_pointer_safety (C++11)
Divers
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Miscellaneous
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pointer_traits (C++11)
addressof (C++11)
align (C++11)
Bibliothèque C
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C Library
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Faible niveau de gestion de la mémoire
Fonctions
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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)
nothrow_t
Types
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Types
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new_handler
Objets
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Objects
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nothrow
 
Défini dans l'en-tête <new>
std::new_handler set_new_handler(std::new_handler new_p)
Fait new_p la nouvelle donne mondiale nouvelle fonction gestionnaire et renvoie le déjà installé la nouvelle gestionnaire .
Original:
Makes new_p the new global new-handler function and returns the previously installed new-handler.
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Sommaire

[modifier] Notes

La fonction' new-handler est la fonction appelée par <div class="t-tr-text">fonctions d'allocation
Original:
allocation functions
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chaque fois qu'une tentative d'allocation de mémoire échoue. Son but visé est l'une des trois choses suivantes:
Original:
The new-handler function is the function called by
fonctions d'allocation
Original:
allocation functions
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</div> whenever a memory allocation attempt fails. Its intended purpose is one of three things:
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 1)
libérer de la mémoire
Original:
make more memory available
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2)
terminer le programme (par exemple par std::terminate appel)
Original:
terminate the program (e.g. by calling std::terminate)
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3)
jeter exception de std::bad_alloc type ou dérivé de std::bad_alloc
Original:
throw exception of type std::bad_alloc or derived from std::bad_alloc
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Si les rendements' nouveau gestionnaire, la fonction d'allocation continue d'essayer d'allocation précédemment échoué et appelle la nouvelle nouveau-gestionnaire si l'allocation échoue à nouveau. Pour terminer la boucle, nouvelle-gestionnaire peut appeler std::set_new_handler(nullptr): si, après une tentative allocation échoue, la fonction d'allocation constate que std::get_new_handler retourne une valeur de pointeur null, il std::bad_alloc jeter .
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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Au démarrage du programme, nouveau gestionnaire d' est un pointeur nul .
Original:
At program startup, new-handler is a null pointer.
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[modifier] Paramètres

new_p -
un pointeur de fonction de std::new_handler type, ou un pointeur NULL
Original:
pointer to function of type std::new_handler, or null pointer
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[modifier] Retourne la valeur

Le gestionnaire installé précédemment nouvelle, ou une valeur de pointeur null si aucune n'a été installé .
Original:
The previously-installed new handler, or a null pointer value if none was installed.
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[modifier] Exceptions

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#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';
    }
}

Résultat : 

Memory allocation failed, terminating
std::bad_alloc

[modifier] Voir aussi
fonctions d'allocation
Original:
allocation functions
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(fonction) [edit]
set_new_handler
enregistre un nouveau gestionnaire
Original:
registers a new handler
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(fonction) [edit]
Type de pointeur de fonction du nouveau gestionnaire
Original:
function pointer type of the new handler
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(typedef) [edit]
Exception levée lorsque l'allocation de mémoire échoue
Original:
exception thrown when memory allocation fails
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(classe) [edit]
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