Initializer list — cppreference.com
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(Ne pas confondre avec std :: initializer_list)
Original:
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Ils sont la partie d'un constructeur qui est responsable de membre et l'initialisation ancêtre
Original:
They are the part of a constructor which is responsible for member and ancestor initialization
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Syntaxe
constructor_signature : member_constructor_calls { constructor_body }
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Explication
La liste d'initialisation est le lieu où l'initialisation de l'objet doit se produire, c'est là que les constructeurs des classes de base et les membres sont appelés .
Original:
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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Les membres sont initialisées dans l'ordre où elles sont déclarées, et non tels qu'ils apparaissent dans la liste d'initialisation .
Original:
Members are initialized in the same order as they are declared, not as they appear in the initializer list.
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Si un paramètre dans le constructeur a le même nom que l'un des membres, l'ambiguïté de cet identificateur étant passé dans un appel de constructeur à l'intérieur de la liste intializer est résolu choisir le paramètre (et non le membre) .
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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Membres ou des classes de base ne présentent pas dans la liste par défaut sera construite
Original:
Members or base classes not present in the list will be default constructed
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Exemple
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 } };