int num;

ConstClass(int x) { num = x; }

// print() should not change the object, so we declare it const

void print() const { std::cout << "num=" << num << std::endl;}

// const is part of the method signature, so func() is overloaded

void func() { std::cout << "func (non-const) " << num << std::endl; }

void func() const { std::cout << "func (const) " << num << std::endl; }

std::cout << "stuff function:" << std::endl;

obj.print();

obj.func();

std::cout << std::endl;

ConstClass nonConstObj(20);

const ConstClass constObj(10);

ConstClass * ptr = &nonConstObj;

const ConstClass * constPtr = &constObj;

std::cout << "nonConstObj:" << std::endl;

nonConstObj.print();

nonConstObj.func();

std::cout << std::endl;

std::cout << "constObj:" << std::endl;

constObj.print();

constObj.func();

std::cout << std::endl;

std::cout << "non-const pointer to nonConstObj:" << std::endl;

ptr->print();

ptr->func();

std::cout << std::endl;

std::cout << "const pointer to constObj:" << std::endl;

constPtr->print();

constPtr->func();

std::cout << std::endl;

constPtr = &nonConstObj;

std::cout << "const pointer to nonConstObj:" << std::endl;

constPtr->print();

constPtr->func();

std::cout << std::endl;

std::cout << "stuff(nonConstObj):" << std::endl;

stuff(nonConstObj);

std::cout << std::endl;

std::cout << "stuff(constObj):" << std::endl;

stuff(constObj);

std::cout << std::endl;

return 0;