Namespace
Varianti

std::calloc

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
Original:
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
Original:
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
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)
Varie
Original:
Miscellaneous
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pointer_traits(C++11)
addressof(C++11)
align(C++11)
C Library
Original:
C Library
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malloc
calloc
 
Defined in header <cstdlib>
void* calloc( std::size_t num, std::size_t size );
Alloca la memoria per un array di oggetti di num size dimensioni ed è zero-inizializza.
Original:
Allocates memory for an array of num objects of size size and zero-initializes it.
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In caso di assegnazione ha esito positivo, restituisce un puntatore al più basso del (primo) byte nel blocco di memoria allocata che sia adeguatamente allineato per qualsiasi tipo di oggetto.
Original:
If allocation succeeds, returns a pointer to the lowest (first) byte in the allocated memory block that is suitably aligned for any object type.
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Se size è zero, il comportamento è definito di attuazione (puntatore nullo possono essere restituiti, o qualche non-puntatore nullo può essere restituito, che non può essere utilizzato per accedere allo storage)
Original:
If size is zero, the behavior is implementation defined (null pointer may be returned, or some non-null pointer may be returned that may not be used to access storage)
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Indice

[modifica] Parametri

num -
numero di oggetti
Original:
number of objects
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size -
dimensione di ciascun oggetto
Original:
size of each object
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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] Note

A causa dei requisiti di allineamento, il numero di byte allocati non è necessariamente uguale al num*size.
Original:
Due to the alignment requirements, the number of allocated bytes is not necessarily equal to num*size.
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[modifica] Esempio

[modifica] Vedi anche

C documentation for calloc