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In C++, is it possible to call a function of an instance before the constructor of that instance completes?
e.g. if A's constructor instantiates B and B's constructor calls one of A's functions.
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You can call a virtual function in a constructor. The Objects are constructed from the base up, “base before derived”.
the constructor is the first function which get called. and we can access the this pointer via constructor for the first time. if we are able to get the this pointer before constructor call (may be via malloc which will not call constructor at all), we can call member function even before constructor call.
A constructor can call methods, yes. A method can only call a constructor in the same way anything else can: by creating a new instance.
Yes, that's possible. However, you are responsible that the function invoked won't try to access any sub-objects which didn't have their constructor called. Usually this is quite error-prone, which is why it should be avoided.
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