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      <metanoindex/>

       
      C++
       
      Sprache C++
      Allgemeine Themen
      Original:
      General topics
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      Flusskontrolle
      Original:
      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
      Original:
      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
      Original:
      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
      Original:
      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 der Anzahl von Elementen in einer Parameter Pack .
      Original:
      Queries the number of elements in a Parameter Pack.
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      Syntax

      sizeof...( parameter_pack ) (seit C++11)
      Gibt ein Objekt vom Typ std::size_t .
      Original:
      Returns an object of type std::size_t.
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      Erklärung

      Gibt die Anzahl der Elemente in einem Parameter Pack .
      Original:
      Returns the number of elements in a Parameter Pack.
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      Keywords

      sizeof

      Beispiel

      #include <iostream>

template<class... Args>
std::size_t f()
{
    return sizeof...(Args);
}

int main()
{
    std::cout << f<>() << '\n'
              << f<int>() << '\n'
              << f<char, int, double>() << '\n';
}

      Output: 

      0
1
3

      Siehe auch