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alignas specifier

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C++
 
Linguaggio C + +
Temi generali
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General topics
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Controllo del flusso
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Flow control
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Dichiarazioni esecuzione condizionale
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Conditional execution statements
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Iterazione dichiarazioni
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Vai dichiarazioni
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Funzioni
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dichiarazione di funzione
lambda funzione dichiarazione
funzione di modello
specificatore inline
eccezioni specifiche (deprecato)
noexcept specificatore (C++11)
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Tipi
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv specificatori
Durata di stoccaggio specificatori
constexpr specificatore (C++11)
specificatore auto (C++11)
alignas specificatore (C++11)
Inizializzazione
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Initialization
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Letterali
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Tipi
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typedef declaration
Tipo alias dichiarazione (C++11)
attributi (C++11)
Lancia
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Classi
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Classes
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Specifiche per una classe di funzioni proprietà
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esplicito (C++11)
statico
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Modelli
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Templates
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classe template
funzione di modello
modello di specializzazione
parametri confezioni (C++11)
Varie
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Montaggio in linea
 
Specifica i requisiti di allineamento di un tipo o di un oggetto.
Original:
Specifies the alignment requirement of a type or an object.
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Indice

[modifica] Sintassi

alignas( expression ) (dal C++11)
alignas( type-id ) (dal C++11)

[modifica] Spiegazione

Lo specificatore alignas può essere applicato alla dichiarazione di una variabile o di un membro di dati di classe, oppure può essere applicato alla definizione di una classe / struct / union o enum.
Original:
The alignas specifier may be applied to the declaration of a variable or a class data member, or it can be applied to the definition of a class/struct/union or enum.
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Quando utilizzato in forma alignas(expression), e expression è un'espressione costante integrale che restituisce un valore positivo, l'entità dichiarato avrà il suo set requisito allineamento esattamente il risultato della expression, salvo che indebolirebbe la condizione naturale allineamento del tipo.
Original:
When used in form alignas(expression), and expression is an integral constant expression that evaluates to a positive value, the declared entity will have its alignment requirement set to exactly the result of the expression, except if it would weaken the natural alignment requirement of the type.
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Quando utilizzato in forma alignas(type), è esattamente equivalente a alignas(alignof(type)), cioè, la condizione di allineamento dell'entità dichiarati sarà uguale al requisito di allineamento type
Original:
When used in form alignas(type), is exactly equivalent to alignas(alignof(type)), that is, the alignment requirement of the declared entity will be equal the alignment requirement of type
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[modifica] Note

alignas(0) non ha alcun effetto.
Original:
alignas(0) has no effect.
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Quando più specificatori alignas sono applicati alla stessa variabile o di classe, la massima si è utilizzato.
Original:
When multiple alignas specifiers are applied to the same variable or class, the strictest one is used.
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Il linguaggio C definisce alignas come macro di preprocessore in <stdalign.h> intestazione, ma in C + + si tratta di una parola chiave, e le intestazioni <stdalign.h> e <cstdalign> non definiscono tale macro. Essi, tuttavia, definire la macro __alignas_is_defined costante.
Original:
The C language defines alignas as a preprocessor macro in the header <stdalign.h>, but in C++ this is a keyword, and the headers <stdalign.h> and <cstdalign> do not define such macro. They do, however, define the macro constant __alignas_is_defined.
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[modifica] Parole chiave

alignas

[modifica] Esempio

// every object of type sse_t will be aligned to 16-byte boundary
struct alignas(16) sse_t
{
  float sse_data[4];
};
 
// the array "cacheline" will be aligned to 128-byte boundary
char alignas(128) cacheline[128];



[modifica] Vedi anche

alignof operator queries alignment requirements of a type (dal C++11) [modifica]
(C++11)
ottiene requisiti di allineamento del tipo
Original:
obtains the type's alignment requirements
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(classe template) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/language/alignas&oldid=25919"