Re: [Boost-users] [function] Defect or feature?

9 Nov 2009

      AMDG

Germán Diago wrote:
...
Hello. I think this code should work (or convince me why not):
#include 
class A {};
class B : public A {};
typedef boost::function F;
void hello(B &)
{
}
int main()
{
   F f(&hello);
}
Since A & can accept Bs &, should this code work?
No it shouldn't.  hello takes a B&. F can take any A& even one
that isn't really a B.  It would work if it were the other way around:

typedef boost::function F;
void hello(A&) {}

In Christ,
Steven Watanabe