Cpp > Programs

class, pointer and reference tutorials

#include <iostream.h>

class myClass
{
public:
myClass(int val=0):myValue(val) { cout << "In myClass constructor\n"; }
myClass(const myClass & rhs):myValue(rhs.myValue) { cout << "In myClass copy constructor\n"; }
~myClass() { cout << "In myClass Destructor\n"; }
int GetValue() const { return myValue; }
void SetValue(int theVal) { myValue = theVal; }
private:
int myValue;
};

void SomeFunction();
myClass &WorkFunction();

int main()
{
SomeFunction();
return 0;
}

myClass &WorkFunction()
{
   myClass * pC = new myClass(5);
   return *pC;
}

void SomeFunction()
{
   myClass &rC = WorkFunction();
   int value = rC.GetValue();
   cout << "rC's value: " << value << endl;
   myClass * pC = &rC; // get a pointer to the memory
   delete pC;  // oops, now rC is a reference to a null object!
}