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std::realloc

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< cpp‎ | memory‎ | c

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C++
 
Bibliothèque d'utilitaires
 
La gestion dynamique de la mémoire
Faible niveau de gestion de la mémoire
Répartiteurs
Original:
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
Original:
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
Original:
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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realloc
free
 
Déclaré dans l'en-tête <cstdlib>
void *realloc( void *ptr, std::size_t new_size );
Redistribue la zone de mémoire donnée. Il doit être préalablement alloué par malloc(), calloc() ou realloc() et non encore libérés avec free(), sinon, le résultat est indéfini .
Original:
Reallocates the given area of memory. It must be previously allocated by malloc(), calloc() or realloc() and not yet freed with free(), otherwise, the results are undefined.
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La réattribution est effectuée soit par:
Original:
The reallocation is done by either:
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a)
extension de la zone existante désignée par ptr, si possible. Le contenu de la zone restent inchangés jusqu'à concurrence du moindre des tailles anciens et nouveaux. Si la zone est étendue, le contenu de la nouvelle partie du tableau ne sont pas définis .
Original:
expanding the existing area pointed to by ptr, if possible. The contents of the area remain unchanged up to the lesser of the new and old sizes. If the area is expanded, the contents of the new part of the array are undefined.
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b)
attribution d'un nouveau bloc de mémoire d'octets new_size taille, la copie zone de mémoire à taille égale au moindre de la nouvelle et l'ancienne taille, et la libération de l'ancien bloc .
Original:
allocating a new memory block of size new_size bytes, copying memory area with size equal the lesser of the new and the old sizes, and freeing the old block.
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S'il n'y a pas assez de mémoire, le bloc de mémoire ancienne n'est pas libéré et pointeur NULL est retourné .
Original:
If there is not enough memory, the old memory block is not freed and null-pointer is returned.
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Sommaire

[modifier] Paramètres

ptr -
pointeur sur la zone mémoire pour être réaffecté
Original:
pointer to the memory area to be reallocated
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new_size -
nouvelle taille de la matrice
Original:
new size of the array
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[modifier] Retourne la valeur

Pointeur au début de la mémoire nouvellement allouée ou si NULL erreur s'est produite. Le pointeur doit être libérée avec free() .
Original:
Pointer to the beginning of newly allocated memory or NULL if error has occurred. The pointer must be deallocated with free().
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[modifier] Exemple

This section is incomplete
Reason: no example

[modifier] Voir aussi

C documentation for realloc
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/memory/c/realloc&oldid=48684 »