Re: [Algorithms] C++ inherited constructors

[Peter D. <pd...@mm...>]

> You can't call virtual functions from constructors.  Doing so is
> undefined in C++.  (MSVC will call the local instantiation, even when
> there's an overloaded one, for instance.)

Actually you can, and it's well defined. The problem is that in the
constructor the static and the dynamic type of "this" are the same.

#include <iostream>

struct A
{
    virtual void f() const { std::cout << "A::f()\n"; }
};

void g(A const & a)
{
    a.f();
}

struct B: A
{
    B() { g(*this); }
    virtual void f() const { std::cout << "B::f()\n"; }
};

struct C: B
{
    virtual void f() const { std::cout << "C::f()\n"; }
};

int main()
{
    C c;
    return 0;
}

--
Peter Dimov
Multi Media Ltd.