std::calloc

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Coppie e tuple Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Swap, in avanti e spostare Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
pointer_traits (C++11)
addressof (C++11)
align (C++11)
C Library Original: C Library The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
malloc calloc	realloc free

 

Elemento definito nell'header <cstdlib>
void* calloc(std::size_t num, std::size_t size );

Alloca la memoria per un array di oggetti di numsize dimensioni ed è zero-inizializza.

Original:

Allocates memory for an array of num objects of size size and zero-initializes it.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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)

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Parametri

num	-	numero di oggetti Original: number of objects The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
size	-	dimensione di ciascun oggetto Original: size of each object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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().

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Vedi anche

C documentation for calloc