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typeid operator

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Exceptions
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Namespaces
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Types
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Types
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decltype specifier (C++11)
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Initialization
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alternative Darstellungen
Utilities
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Utilities
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Types
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Types
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typedef declaration
Typ Aliasdeklaration (C++11)
Attribute (C++11)
Wirft
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Casts
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Memory allocation
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Classes
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Classes
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Class-spezifische Funktion Eigenschaften
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Class-specific function properties
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statisch
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Special member functions
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Verschiedenes
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Miscellaneous
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Inline Montage
 
Abfragen Information eines Typ .
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Queries information of a type.
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Dort eingesetzt, wo der tatsächliche Typ eines virtuell Basisklasse muss bekannt sein .
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Used where the actual type of a virtuell base class must be known.
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Inhaltsverzeichnis

[Bearbeiten] Syntax

typeid( type ) (1)
typeid( expression ) (2)
Header <typeinfo> muss vor der Verwendung typeid Betreiber aufgenommen werden .
Original:
Header <typeinfo> must be included before using typeid operator.
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Beide Versionen gibt ein Objekt vom Typ const std::type_info& .
Original:
Both versions return an object of type const std::type_info&.
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[Bearbeiten] Erklärung

1)
gibt den Typ Informationen über die type. Die Art wird auf jeden Fall bekannt sein Kompilierung und keine Laufzeit-Overhead verursacht wird .
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)
Ausdruck ausgewertet und Typ-Information entsprechend der erhaltenen Wert zurückgegeben. Wenn die expression in einer virtuellen Basisklasse, wird die tatsächliche Typ der Klasse dynamisch mit einigen Runtime-Overhead abgefragt. Andernfalls wird der tatsächliche Typ ist definitiv bekannt, Kompilierung und keine Runtime-Overhead verursacht wird .
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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[Bearbeiten] Keywords

typeid

[Bearbeiten] Beispiel