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std::uses_allocator

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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
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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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Elemento definito nell'header <memory>
template< class T, class Alloc >
struct uses_allocator
 (dal C++11)
Se T ha un allocator_type membro typedef che è convertibile da Alloc, fornisce l'elemento costante value pari a true. In caso contrario, è value false.
Original:
If T has a member typedef allocator_type which is convertible from Alloc, provides the member constant value equal to true. Otherwise value is false.
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Indice

Inherited from std::integral_constant

Member constants

value
[statico]
true se T uses allocator Alloc, false altrimenti
Original:
true if T uses allocator Alloc, false otherwise
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(pubblico membro statico costante)

Member functions

operator bool
converte l'oggetto in bool, restituisce value
Original:
converts the object to bool, returns value
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(metodo pubblico)

Member types

Tipo
Original:
Type
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 Definition
value_type bool
type std::integral_constant<bool, value>

[modifica] Specializzazioni

Specializzazioni personalizzate del tipo di carattere std::uses_allocator sono consentiti per i tipi che non hanno il allocator_type membro typedef, ma che una delle seguenti due condizioni:
Original:
Custom specializations of the type trait std::uses_allocator are allowed for types that do not have the member typedef allocator_type but satisfy one of the following two requirements:
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1)
T ha un costruttore che prende std::allocator_arg_t come primo argomento, e Alloc come secondo argomento.
Original:
T has a constructor which takes std::allocator_arg_t as the first argument, and Alloc as the second argument.
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2)
T ha un costruttore che prende Alloc come ultimo argomento.
Original:
T has a constructor which takes Alloc as the last argument.
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Le specializzazioni sono già fornite dalla libreria standard:
Original:
The following specializations are already provided by the standard library:
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(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(classe modello di specializzazione) [modifica]
(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(funzione di modello) [modifica]
(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(funzione di modello) [modifica]
(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(funzione di modello) [modifica]
(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(classe modello di specializzazione) [modifica]
(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(classe modello di specializzazione) [modifica]
(C++11)
specializzata il tratto tipo std::uses_allocator
Original:
specializes the std::uses_allocator type trait
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(classe modello di specializzazione) [modifica]

[modifica] Note

Questa caratteristica tipo viene utilizzato da std::scoped_allocator_adaptor e possono essere utilizzati da allocatore personalizzati per determinare se l'oggetto in costruzione è di per sé in grado di utilizzare un allocatore (ad esempio è un contenitore), nel qual caso un allocatore deve essere passato al costruttore.
Original:
This type trait is used by std::scoped_allocator_adaptor and may be used by custom allocators to determine whether the object being constructed is itself capable of using an allocator (e.g. is a container), in which case an allocator should be passed to its constructor.
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[modifica] Vedi anche

(C++11)
un oggetto di std::allocator_arg_t tipo usato per selezionare allocatore-aware costruttori
Original:
an object of type std::allocator_arg_t used to select allocator-aware constructors
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(costante) [modifica]
(C++11)
tipo di tag utilizzato per selezionare allocatore-aware overload del costruttore
Original:
tag type used to select allocator-aware constructor overloads
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(classe) [modifica]
(C++11)
implementa multilivello allocatore per contenitori multi-livello
Original:
implements multi-level allocator for multi-level containers
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(classe template) [modifica]
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