Language: C C++ D Haskell Lua OCaml PHP Perl Plain Text Python Ruby Scheme Tcl #include <iostream> class Foo { int x; friend void bar(Foo&); public: explicit Foo(int x) : x(x) { } void foo() { std::cout << "mine's ex: " << x << std::endl; } }; class Bar : public Foo { public: Bar(int x) : Foo(x) {} }; void bar(Foo& f) { f.x++; } int main() { char z = 66; Bar *f = new Bar(z); f->foo(); bar(*f); f->foo(); return 0; } Private [?] Run code