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Union declaration

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C++
 
Sprache C++
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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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Types
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Types
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union-Typen
Funktionstypen
decltype specifier (C++11)
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Specifiers
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Initialization
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Utilities
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Utilities
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typedef declaration
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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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Inline Montage
 
This section is incomplete
Reason: Expand description and example
Eine Gewerkschaft ist eine spezielle Klasse Typ, der alle seine Daten speichert Mitglieder in den gleichen Speicherplatz .
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A union is a special class type that stores all of its data members in the same memory location.
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Gewerkschaften können keine virtuellen Funktionen vererbt werden oder erben anderen Klassen .
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Unions cannot have virtual functions, be inherited or inherit other classes.
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(bis C + +11) Unions kann nur POD (plain old data) Typen .
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(bis C + +11) Unions can only contain POD (plain old data) types.
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(seit C++11) Wenn eine Gewerkschaft enthält eine nicht-POD Element, das eine benutzerdefinierte besondere Funktion hat (Konstruktor, Destruktor, Copy-Konstruktor oder Zuweisungsoperator) diese Funktion standardmäßig in der Gewerkschaft wird gelöscht und muss explizit durch den Benutzer definiert werden .
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(seit C++11) If a union contains a non-POD member, which has a user-defined special function (constructor, destructor, copy constructor or copy assignment) that function is deleted by default in the union and needs to be defined explicitly by the user.
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Inhaltsverzeichnis

[Bearbeiten] Syntax

union name { member_declarations } object_list (optional) ; (1)
union { member_declarations } ; (2)

[Bearbeiten] Erklärung

# Benannt Gewerkschaft
Original:
#Named union
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# Anonymous Gewerkschaft
Original:
#Anonymous union
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[Bearbeiten] Anonymous Gewerkschaften

Mitglieder eines anonymen union sind von der umgebenden Gültigkeitsbereich als einzelne Variablen .
Original:
Members of an anonymous union are accessible from the enclosing scope as single variables.
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Anonymous Gewerkschaften haben weitere Einschränkungen: Sie dürfen nur öffentliche Mitglieder haben und nicht Elementfunktionen .
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Anonymous unions have further restrictions: they must have only public members and cannot have member functions.
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Namespace-scope anonymen Gewerkschaften müssen statisch sein .
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Namespace-scope anonymous unions must be static.
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[Bearbeiten] Beispiel

union foo
{
  int x;
  signed char y;
};
 
int main()
{
  foo.x = 128 + 896;
  std::cout << "as int: "  << (int)foo.x << '\n';
  std::cout << "as char: " << (int)foo.y << '\n';
  return 0;
}

Output: 

as int: 1024
as char: 128
(Für Little-Endian-Prozessoren)
Original:
(for little-endian processors)
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Von „https://de.cppreference.com/mwiki/index.php?title=cpp/language/union&oldid=27123“