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#include <stdio.h>

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 <typename T>

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<ClassB>; //<- template function as custom function

ClassB b3;

printf("\n");

ClassC::function = function1<ClassC>; //<- same template function as different custom function

ClassC c1;

return 0;

}

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