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    constexpr specifier (seit C++11)

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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
    Lambda-Funktion Erklärung
    Funktions-Template
    inline-Spezifizierer
    Exception-Spezifikationen (veraltet)
    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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    explizit (C++11)
    statisch
    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
     
    • constexpr - bedeutet, der Wert eines Ausdrucks kann zur Übersetzungszeit berechnet werden.
      Original:
      constexpr - specifies that the value of a variable or function can be computed at compile time
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    Erklärung

    constexpr Spezifizierer legt fest, dass es möglich sein muss, den Wert des Ausdrucks zur Übersetzungszeit zu berechnen. Der Ausdruck kann dann dort verwendet werden, wo nur zur Kompilierungszeit konstante Ausdrücke erlaubt sind. constexpr bedeutet const .
    Original:
    constexpr specifier declares that it is possible to evaluate the value of the function or variable at compile time, they then can be used where only compile time konstante Ausdrücke are allowed. constexpr implies const.
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    'constexpr Variablen' muss die folgenden Anforderungen erfüllen:
    Original:
    constexpr variables must satisfy the following requirements:
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    • Es muss sofort gebaut werden oder ein Wert zugewiesen .
      Original:
      it must be immediately constructed or assigned a value.
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    • der Konstruktor Parameter oder der Wert zugewiesen werden darf nur literalen Werten, constexpr Variablen und Funktionen .
      Original:
      the constructor parameters or the value to be assigned must contain only literal values, constexpr variables and functions.
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    • der Konstruktor verwendet, um das Objekt (entweder implizit oder explizit) konstruieren müssen den Anforderungen der constexpr Konstruktor. Im Falle der expliziten Konstruktor, muss es constexpr angegeben haben .
      Original:
      the constructor used to construct the object (either implicit or explicit) must satisfy the requirements of constexpr constructor. In the case of explicit constructor, it must have constexpr specified.
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    'constexpr Funktionen' muss die folgenden Anforderungen erfüllen:
    Original:
    constexpr functions must satisfy the following requirements:
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    • es darf nicht virtuell
      Original:
      it must not be virtual
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    • seine Rückkehr Typ muss LiteralType sein
      Original:
      its return type must be LiteralType
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    • jeder seiner Parameter müssen wörtliche Typ sein
      Original:
      each of its parameters must be literal type
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    • die Funktion Körper muss entweder gelöscht oder ausgefallen oder enthalten nur die folgenden:
      Original:
      the function body must be either deleted or defaulted or contain only the following:
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    • null Aussagen
      Original:
      null statements
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    • static_assert Erklärungen
      Original:
      static_assert declarations
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    • typedef Erklärungen und Alias Erklärungen, die nicht definieren Klassen oder Aufzählungen
      Original:
      typedef declarations and Alias declarations that do not define classes or enumerations
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    • mit Erklärungen
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      using declarations
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    • using-Direktiven
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      using directives
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    • genau ein return Anweisung, die nur literalen Werten, constexpr Variablen und Funktionen enthält .
      Original:
      exactly one return statement that contains only literal values, constexpr variables and functions.
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    'constexpr Konstruktor' muss folgenden Anforderungen genügen:
    Original:
    constexpr constructor must satisfy the following requirements:
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    • jeder seiner Parameter müssen wörtliche Typ sein
      Original:
      each of its parameters must be literal type
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    • Die Klasse muss keine virtuellen Basisklassen
      Original:
      the class must have no virtual base classes
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    • der Konstruktor Körper muss entweder gelöscht oder ausgefallen oder enthalten nur die folgenden:
      Original:
      the constructor body must be either deleted or defaulted or contain only the following:
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    • null Aussagen
      Original:
      null statements
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    • static_assert Erklärungen
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      static_assert declarations
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    • typedef Erklärungen und Alias Erklärungen, die nicht definieren Klassen oder Aufzählungen
      Original: