#include
class ClassA {
public:
virtual void print() = 0;
};
class ClassB : public ClassA {
public:
ClassB() {
printf("%s\n", __PRETTY_FUNCTION__);
if (function) function(this);
else printf(" no function\n");
}
virtual void print() { printf("%s\n", __PRETTY_FUNCTION__); }
void onlyB() { printf("%s\n", __PRETTY_FUNCTION__); }
typedef void(*Function)(ClassB*);
static Function function;
};
ClassB::Function ClassB::function = 0;
class ClassC : public ClassA {
public:
typedef void(*Function)(ClassC*);
ClassC(Function f) {
f(this);
}
ClassC() {
printf("%s\n", __PRETTY_FUNCTION__);
if (function) function(this);
}
virtual void print() { printf("%s\n", __PRETTY_FUNCTION__); }
void c() { printf("%s\n", __PRETTY_FUNCTION__); }
static Function function;
};
ClassC::Function ClassC::function = 0;
// special function for ClassB
void funcB(ClassB* b) {
printf(" SPECIAL(B) %s -> ", __PRETTY_FUNCTION__);
b->onlyB();
}
// generic template function
template
void function1(T* t) { printf(" TEMPLATE(T) %s -> ", __PRETTY_FUNCTION__); t->print(); }
int main() {
// 3 ClassB instantiations: none, custom and generic function
ClassB::function = 0;
ClassB b1;
ClassB::function = funcB;
ClassB b2;
ClassB::function = function1; //<- template function as custom function
ClassB b3;
printf("\n");
ClassC::function = function1; //<- same template function as different custom function
ClassC c1;
return 0;
}