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    typeid operator

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    C++
     
    Sprache C++
    Allgemeine Themen
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    General topics
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    Flusskontrolle
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    Flow control
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    Bedingte Ausführung Aussagen
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    Conditional execution statements
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    Iterationsanweisungen
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    Iteration statements
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    Gehe Aussagen
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    Jump statements
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    Funktionen
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    Functions
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    Funktion Erklärung
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    noexcept Spezifizierer(C++11)
    Ausnahmen
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    Exceptions
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    Namespaces
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    Namespaces
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    Types
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    Types
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    decltype specifier(C++11)
    Specifiers
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    Specifiers
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    cv Planer
    Lagerdauer Planer
    constexpr Spezifizierer(C++11)
    auto Spezifizierer(C++11)
    alignas Spezifizierer(C++11)
    Initialisierung
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    Initialization
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    Literale
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    Literals
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    Expressions
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    Expressions
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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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    impliziten Konvertierungen
    const_cast conversion
    static_cast conversion
    dynamic_cast conversion
    reinterpret_cast conversion
    C-Stil und funktionale Besetzung
    Speicherzuweisung
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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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    Besondere Member-Funktionen
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    Special member functions
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    Templates
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    Templates
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    Klassen-Template
    Funktions-Template
    Template-Spezialisierung
    Parameter Packs(C++11)
    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 conststd::type_info& .
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    Both versions return an object of type conststd::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

    This section is incomplete
    Reason: no example
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/language/typeid&oldid=27122“
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