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std::allocator::allocate

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< cpp‎ | memory‎ | allocator

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C++
 
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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std::allocator
Membri funzioni
Original:
Member functions
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allocator::allocator
allocator::~allocator
allocator::address
allocator::allocate
allocator::deallocate
allocator::max_size
allocator::construct
allocator::destroy
Non membri funzioni
Original:
Non-member functions
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operator==
operator!=
 
pointer allocate( size_type n, std::allocator<void>::const_pointer hint = 0 );
Assegna n * sizeof(T) byte di memoria non inizializzata chiamando ::operator new(std::size_t), ma è specificato quando e come questa funzione viene chiamata. Il hint puntatore può essere usato per fornire frazione di riferimento: l'allocatore, se supportato dall'implementazione, tenterà di allocare il nuovo blocco di memoria più vicino possibile al hint.
Original:
Allocates n * sizeof(T) bytes of uninitialized storage by calling ::operator new(std::size_t), but it is unspecified when and how this function is called. The pointer hint may be used to provide locality of reference: the allocator, if supported by the implementation, will attempt to allocate the new memory block as close as possible to hint.
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Indice

[modifica] Parametri

n -
il numero di oggetti da allocare memoria per
Original:
the number of objects to allocate storage for
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hint -
puntatore a una posizione di memoria nelle vicinanze
Original:
pointer to a nearby memory location
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[modifica] Valore di ritorno

Puntatore al primo byte di un blocco di memoria opportunamente allineati e sufficiente per contenere un array di oggetti di n T tipo.
Original:
Pointer to the first byte of a memory block suitably aligned and sufficient to hold an array of n objects of type T.
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[modifica] Eccezioni

Genera std::bad_alloc se allocazione non riesce.
Original:
Throws std::bad_alloc if allocation fails.
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[modifica] Vedi anche

[statico]
alloca memoria non inizializzata utilizzando l'allocatore
Original:
allocates uninitialized storage using the allocator
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(metodo pubblico statico) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/memory/allocator/allocate&oldid=26097"