C++: Throwing shared_ptr of derived and catching shared_ptr of base?
- by hasvn
Ok, I've been told this problem: Why can you throw a pointer to a derived class and catch a pointer to its base... but you can't do that with shared_ptrs?
Example, this works:
class Base {};
class Derived : public Base {};
int main()
{
try
{
throw new Derived() ;
}
catch( const Base2 * b )
{
printf("Received a base" ) ;
}
return 0 ;
}
But this doesn't
int main()
{
try
{
throw std::tr1::shared_ptr<Derived>( new Derived() ) ;
}
catch( const std::tr1::shared_ptr<Base> & b )
{
printf("Received a base" ) ;
}
return 0 ;
}
Any ideas?
