Namespace
Varianti

typeid operator

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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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Iteration statements
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Vai dichiarazioni
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Jump statements
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Funzioni
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Functions
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dichiarazione di funzione
lambda funzione dichiarazione
funzione di modello
specificatore inline
eccezioni specifiche (deprecato)
noexcept specificatore (C++11)
Eccezioni
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Exceptions
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Spazi dei nomi
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Namespaces
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Tipi
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Types
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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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Literals
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Espressioni
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Expressions
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rappresentazioni alternative
Utilities
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Utilities
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Tipi
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Types
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typedef declaration
Tipo alias dichiarazione (C++11)
attributi (C++11)
Lancia
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Casts
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conversioni implicite
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Fusione C-stile e funzionale
Occupazione della memoria
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Memory allocation
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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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Class-specific function properties
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esplicito (C++11)
statico
Funzioni membro speciali
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Special member functions
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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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Miscellaneous
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Montaggio in linea
 
Informazioni query di tipo.
Original:
Queries information of a type.
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Usato quando il tipo effettivo di una classe base virtuale deve essere noto.
Original:
Used where the actual type of a virtuale base class must be known.
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Indice

[modifica] Sintassi

typeid( type ) (1)
typeid( expression ) (2)
<typeinfo> intestazione devono essere presenti prima di utilizzare l'operatore typeid.
Original:
Header <typeinfo> must be included before using typeid operator.
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Entrambe le versioni restituire un oggetto di tipo const std::type_info&.
Original:
Both versions return an object of type const std::type_info&.
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[modifica] Spiegazione

1)
restituisce le informazioni sul tipo di type. Il tipo sarà sicuramente noto in fase di compilazione e non appesantisce il runtime è causato.
Original:
returns the type information about the type. The type will be definitely known compile time and no runtime overhead is caused.
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2)
espressione viene valutata e informazioni sul tipo corrispondente al valore risultante viene restituito. Se il expression è in una classe base virtuale, il tipo effettivo della classe viene interrogato in modo dinamico con un po 'di overhead. In caso contrario, il tipo effettivo è sicuramente noto in fase di compilazione e non appesantisce il runtime è causato.
Original:
expression is evaluated and type information corresponding to the resulting value is returned. If the expression is in a virtual base class, the actual type of the class is queried dynamically with some runtime overhead. Otherwise the actual type is definitely known compile time and no runtime overhead is caused.
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[modifica] Parole chiave

typeid

[modifica] Esempio

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