Initializer list
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(Не путать с зЬй :: initializer_list)
Original:
( Not to be confused with зЬй :: initializer_list )
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Они являются частью конструктор, который несет ответственность за член и предков инициализации
Original:
They are the part of a constructor which is responsible for member and ancestor initialization
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[править] Синтаксис
constructor_signature : member_constructor_calls { constructor_body }
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[править] Объяснение
Инициализатор список является местом, где инициализации объекта должно произойти, есть где конструкторы базовых классов и членов называется.
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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Пользователи инициализируются в том же порядке, как они были объявлены, а не как они появляются в списке инициализаторов.
Original:
Members are initialized in the same order as they are declared, not as they appear in the initializer list.
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Если параметр в конструктор имеет то же имя, как одного из членов, неоднозначность этот идентификатор передается в вызове конструктора внутри intializer список будет решен выбора параметра (а не член).
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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Члены или базовых классов нет в списке будет построена по умолчанию
Original:
Members or base classes not present in the list will be default constructed
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[править] Пример
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 } };
