std::alignment_of

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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
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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
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Tipo di supporto
Tipi base
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Basic types
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Tipi fondamentali
Larghezza fissa interi tipi(C++11)
Limiti numerici
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Numeric limits
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numeric_limits
C numerico limita interfaccia
Informazioni sul tipo di runtime
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Runtime type information
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Tipo tratti
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Type traits
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Categorie di tipo primario
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Primary type categories
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is_void(C++11)
is_array(C++11)
is_pointer(C++11)
is_enum(C++11)
is_union(C++11)
is_class(C++11)
is_function(C++11)
is_reference(C++11)
is_lvalue_reference(C++11)
is_rvalue_reference(C++11)
is_member_pointer(C++11)
is_member_object_pointer(C++11)
is_member_function_pointer(C++11)
Proprietà del tipo
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Type properties
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is_const(C++11)
is_volatile(C++11)
is_pod(C++11)
is_empty(C++11)
is_polymorphic(C++11)
is_abstract(C++11)
Operazioni supportate
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Supported operations
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is_constructible
is_trivially_constructible
is_nothrow_constructible		(C++11)
(C++11)
(C++11)
is_default_constructible
is_trivially_default_constructible
is_nothrow_default_constructible		(C++11)
(C++11)
(C++11)
is_copy_constructible
is_trivially_copy_constructible
is_nothrow_copy_constructible		(C++11)
(C++11)
(C++11)
is_move_constructible
is_trivially_move_constructible
is_nothrow_move_constructible		(C++11)
(C++11)
(C++11)
is_assignable
is_trivially_assignable
is_nothrow_assignable		(C++11)
(C++11)
(C++11)
is_copy_assignable
is_trivially_copy_assignable
is_nothrow_copy_assignable		(C++11)
(C++11)
(C++11)
is_move_assignable
is_trivially_move_assignable
is_nothrow_move_assignable		(C++11)
(C++11)
(C++11)
is_destructible
is_trivially_destructible
is_nothrow_destructible		(C++11)
(C++11)
(C++11)
has_virtual_destructor(C++11)
I rapporti e le query di proprietà
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Relationships and property queries
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is_same(C++11)
is_base_of(C++11)
is_convertible(C++11)
alignment_of(C++11)
rank(C++11)
extent(C++11)
Tipo modifiche
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Type modifications
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Tipo di trasformazioni
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Type transformations
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aligned_storage(C++11)
aligned_union(C++11)
decay(C++11)
enable_if(C++11)
Digitare costanti tratto
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Type trait constants
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integral_constant(C++11)
 
Elemento definito nell'header <type_traits>
template<class T >
struct alignment_of;
(dal C++11)
Fornisce il membro costante value uguale al valore allineamento del T tipo, come se ottenuto da un'espressione alignof. Se T è un tipo di matrice, restituisce i requisiti di allineamento del tipo di elemento.
Original:
Provides the member constant value equal to the alignment requirement of the type T, as if obtained by an alignof expression. If T is an array type, returns the alignment requirements of the element type.
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Indice

Inherited from std::integral_constant

Member constants

value
[statico]
alignof(typenamestd::remove_all_extents<T>::type)
(pubblico membro statico costante)

Member functions

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

Member types

Tipo
Original:
Type
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 Definition
value_typestd::size_t
typestd::integral_constant<std::size_t, value>

[modifica]Possibile implementazione

template<class T >struct alignment_of :std::integral_constant<std::size_t, alignof(typenamestd::remove_all_extents<T>::type)>{};

[modifica]Esempio

#include <iostream>#include <type_traits>   class A {};   int main(){std::cout<< std::alignment_of<A>::value<<'\n';std::cout<< std::alignment_of<int>::value<<'\n';std::cout<< std::alignment_of<double>::value<<'\n';}

Output: 

1 4 8

[modifica]Vedi anche

alignof operator queries alignment requirements of a type (dal C++11)[modifica]
(C++11)
definisce il tipo idoneo all'uso come memoria non inizializzato per tipi di dimensione data
Original:
defines the type suitable for use as uninitialized storage for types of given size
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(classe template)[modifica]
(C++11)
definisce il tipo adatto per l'uso come memoria non inizializzata per tutti i tipi di dati
Original:
defines the type suitable for use as uninitialized storage for all given types
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(classe template)[modifica]
(C++11)
Tipo di POD con il requisito di allineamento così grande come qualsiasi altro scalare
Original:
POD type with alignment requirement as great as any other scalar type
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(typedef)[modifica]
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