Namespace
Varianti

std::is_standard_layout

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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)
 
Tipo di supporto
Tipi base
Original:
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
Original:
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_object(C++11)
is_scalar(C++11)
is_compound(C++11)
is_integral(C++11)
is_floating_point(C++11)
is_fundamental(C++11)
is_arithmetic(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)
is_trivial(C++11)
is_trivially_copyable(C++11)
is_standard_layout(C++11)
is_literal_type(C++11)
is_signed(C++11)
is_unsigned(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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remove_cv
remove_const
remove_volatile		(C++11)
(C++11)
(C++11)
add_cv
add_const
add_volatile		(C++11)
(C++11)
(C++11)
make_signed(C++11)
make_unsigned(C++11)
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)
conditional(C++11)
common_type(C++11)
underlying_type(C++11)
result_of(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 is_standard_layout;
 (dal C++11)
Se T è un tipo di formato standard (cioè, un tipo scalare, uno standard-layout classe, o una matrice di questo tipo / classe, possibilmente cv qualificato), fornisce il membro costante value true uguali. Per qualsiasi altro tipo, è value false.
Original:
If T is a standard layout type (that is, a scalar type, a standard-layout class, or an array of such type/class, possibly cv-qualified), provides the member constant value equal true. For any other type, value is false.
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Uno standard-layout della classe è una classe che
Original:
A standard-layout class is a class that
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1. non ci sono membri non statici di dati che non sono standard-layout
Original:
1. has no non-static data members that aren't standard-layout
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2. non ha funzioni virtuali e non classi base virtuali
Original:
2. has no virtual functions and no virtual base classes
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3. ha lo stesso controllo di accesso per tutti i non-membri dati statici
Original:
3. has the same access control for all non-static data members
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4. non ci sono classi di base che non sono standard-layout
Original:
4. has no base classes that aren't standard-layout
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5. o non ha alcuna classe base con i non-membri dati statici o non ci sono non-membri dati statici nella classe più derivata e una sola base con loro
Original:
5. either has no base class with non-static data members or has no non-static data members in the most derived class and only one base with them
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6. non ci sono classi base dello stesso tipo come il primo membro non statico dati
Original:
6. has no base classes of the same type as the first non-static data member
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Indice

Inherited from std::integral_constant

Member constants

value
[statico]
true se T is a standard-layout type , false altrimenti
Original:
true if T is a standard-layout type , 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] Note

Un puntatore a una norma-layout di classe può essere convertito (con reinterpret_cast) a un puntatore al suo primo membro non statico di dati e viceversa.
Original:
A pointer to a standard-layout class may be converted (with reinterpret_cast) to a pointer to its first non-static data member and vice versa.
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Se uno standard di layout unione contiene due o più standard di layout strutture, è permesso di ispezionare la parte comune iniziale di loro.
Original:
If a standard-layout union holds two or more standard-layout structs, it is permitted to inspect the common initial part of them.
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Il offsetof macro può essere utilizzata solo con standard di layout classi.
Original:
The macro offsetof can only be used with standard-layout classes.
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[modifica] Esempio

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    int m1;
private:
    int m2;
};
 
struct C {
    virtual void foo();
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_standard_layout<A>::value << '\n';
    std::cout << std::is_standard_layout<B>::value << '\n';
    std::cout << std::is_standard_layout<C>::value << '\n';
}

Output: 

true
false
false

[modifica] Vedi anche

(C++11)
 checks if a type is trivially copyable
(classe template) [modifica]
(C++11)
controlla se è un tipo semplice i dati vecchi (POD) di tipo
Original:
checks if a type is plain-old data (POD) type
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(classe template) [modifica]
byte offset dall'inizio di un layout di tipo standard per membro specificato
Original:
byte offset from the beginning of a standard-layout type to specified member
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(funzione macro) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/types/is_standard_layout&oldid=27050"