Initializer list
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(Não deve ser confundido com std :: initializer_list)
Original:
( Not to be confused with std :: initializer_list )
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Eles são parte de um construtor que é responsável pela inicialização membro e ancestral
Original:
They are the part of a constructor which is responsible for member and ancestor initialization
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[editar]Sintaxe
constructor_signature:member_constructor_calls{constructor_body} | |||||||||
[editar]Explicação
A lista de inicializador é o lugar onde a inicialização do objeto deverá ocorrer, não é onde os construtores para classes de base e os membros são chamados.
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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Membros são inicializados na mesma ordem em que são declarados, não como eles aparecem na lista de inicializador.
Original:
Members are initialized in the same order as they are declared, not as they appear in the initializer list.
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Se um parâmetro no construtor tem o mesmo nome de um dos membros, a ambigüidade do que identificador que está sendo passado em uma chamada de construtor dentro da lista intializer é resolvido escolha do parâmetro (e não o membro).
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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Membros ou classes de base não está presente na lista será padrão construído
Original:
Members or base classes not present in the list will be default constructed
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[editar]Exemplo
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}};
