Re: Sanity check: public/private
Carlos Moreno wrote:
If I now replace every single instance of the keyword private
with the keyword public (and I change *nothing else*), would
the behaviour of my program change?
[...]
If necessary, please divide the answer into the following
two cases:
1) private is only used as class-member access specifier
2) private is also used for inheritance.
(I believe the answer NO is valid for both cases, but I'm
mostly interested in case (1), so if the answer is different,
please specify the reasoning for both cases).
At least in the second case, program behaviour may change:
______________________ Example 1 ____________________________
#include <ostream>
#include <iostream>
struct base {};
struct derived : private base {};
int main()
{
try
{
throw derived();
}
catch(base&) { std::cout << "Caught 'base'.\n"; }
catch(derived&) { std::cout << "Caught 'derived'.\n"; };
return 0;
}
______________________ Example 2 ____________________________
#include <ostream>
#include <iostream>
struct base { virtual ~base() {} };
struct derived : private base { base* base_ptr() { return this; } };
int main()
{
std::cout << std::boolalpha
<< (dynamic_cast<derived*>(derived().base_ptr()) != 0) <<
'\n';
return 0;
}
_____________________________________________________________
Falk
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