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Initializer list

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Inicialização
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Initialization
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amigo especificador
listas inicializador
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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
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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
    }
};