Namespace
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std::realloc

Da cppreference.com.
< cpp‎ | memory‎ | c

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Gestione della memoria dinamica
Basso livello di gestione della memoria
Allocatori
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 inizializzata stoccaggio
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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
Puntatori intelligenti
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Smart pointers
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unique_ptr(C++11)
shared_ptr(C++11)
weak_ptr(C++11)
auto_ptr(deprecato)
owner_less(C++11)
enable_shared_from_this(C++11)
bad_weak_ptr(C++11)
default_delete(C++11)
Garbage collection supporto
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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)
Varie
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Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C Library
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C Library
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realloc
free
 
Defined in header <cstdlib>
void *realloc( void *ptr, std::size_t new_size );
Rialloca quella determinata zona di memoria. Deve essere stato precedentemente attribuito dalla malloc(), calloc() o realloc() e non ancora liberato con free(), in caso contrario, i risultati sono indefiniti.
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 ridistribuzione viene eseguita da uno:
Original:
The reallocation is done by either:
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a)
espandendo l'area esistente puntata da ptr, se possibile. Il contenuto della zona rimangono invariate fino al minore delle dimensioni nuove e vecchie. Se l'area è espanso, il contenuto della nuova parte della matrice sono undefined.
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)
alloca un nuovo blocco di memoria di byte new_size dimensioni, la copia area di memoria con dimensioni pari al minore tra il nuovo e il vecchio dimensioni, e liberando il blocco vecchio.
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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Se la memoria non è sufficiente, il blocco di memoria vecchio non viene liberata e null-pointer viene restituito.
Original:
If there is not enough memory, the old memory block is not freed and null-pointer is returned.
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Indice

[modifica] Parametri

ptr -
puntatore all'area di memoria da riassegnare
Original:
pointer to the memory area to be reallocated
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new_size -
nuova dimensione della matrice
Original:
new size of the array
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[modifica] Valore di ritorno

Puntatore all'inizio della memoria appena allocata o NULL in caso di errore si è verificato. Il puntatore deve essere rilasciata con 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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[modifica] Esempio

[modifica] Vedi anche

C documentation for realloc