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Initializer list

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Initialization
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(Nicht zu verwechseln mit std :: initializer_list zu verwechseln)
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( Not to be confused with std :: initializer_list )
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Sie sind der Teil eines Konstruktors, die für Mitgliedes und Vorfahren Initialisierung
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They are the part of a constructor which is responsible for member and ancestor initialization
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[Bearbeiten] Syntax

constructor_signature : member_constructor_calls { constructor_body }

[Bearbeiten] Erklärung

Die Initialisierung Liste ist der Ort, wo der Initialisierung des Objekts auftreten sollte, gibt es, wo die Konstruktoren für Basisklassen und Mitglieder genannt werden .
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The initializer list is the place where initialization of the object should occur, there is where the constructors for base classes and members are called.
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Die Mitglieder werden in der gleichen Reihenfolge initialisiert, wie sie deklariert sind, nicht wie sie in der Initialisierungsliste erscheinen .
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Members are initialized in the same order as they are declared, not as they appear in the initializer list.
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Wenn ein Parameter im Konstruktor hat den gleichen Namen wie eines der Mitglieder, die Zweideutigkeit dieser Kennung in einer Konstruktor-Aufruf innerhalb des intializer Liste übergeben wird gelöst Wahl der Parameter (und nicht das Mitglied) .
Original:
If a parameter in the constructor has the same name as one of the members, the ambiguity of that identifier being passed in a constructor call inside the intializer list is resolved choosing the parameter (and not the member).
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Oder Basisklassen nicht in der Liste vorhanden sein wird standardmäßig gebaut
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Members or base classes not present in the list will be default constructed
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[Bearbeiten] Beispiel

struct Class : public Base
{
    int x;
    int y;
 
    Class ( int x )
      : Base ( 123 ), // initialize base class
        x ( x ),      // x (member) is initialized with x (parameter)
        y ( 0 )       // y initialized to 0
    {}                // empty constructor body
 
    Class ( double a )
      : y ( a+1 ),
        x ( y ) // x will be initialized before y, this means that its value here is undefined
    {}          // No base class constructor in list, this is the same as calling Base()
 
    Class()
    try
      : Base ( 789 ),
        x ( 0 ),
        y ( 0 )
    {
        // no exception
    }
    catch (...)
    {
        // exception occurred on initialization
    }
};