std::realloc

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

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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*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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Parametri

ptr	-	puntatore all'area di memoria da riassegnare Original: pointer to the memory area to be reallocated The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
new_size	-	nuova dimensione della matrice Original: new size of the array 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().

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Vedi anche

C documentation for realloc