#include <string>
#include <sstream> // string stream
#include <memory> // Include memory to use std::unique_ptr
using namespace std;
template <typename T>
class smart_pointer {
private:
T* m_pRawPointer;
public:
// Construcotr
smart_pointer(T* pData) : m_pRawPointer(pData) {};
// Destructor
~smart_pointer() {
cout << "Smart pointer destructor is invoked" << endl;
delete m_pRawPointer;
}
// Operator *
T& operator* () const {
return *(m_pRawPointer);
}
// Operator ->
T* operator-> () const {
return m_pRawPointer;
}
};
class Date {
private:
int Day;
int Month;
int Year;
string DateString; // class
public:
Date (int D, int M, int Y)
: Day(D), Month(M), Year(Y) {};
Date operator - (int DaystoSub) {
return Date(Day - DaystoSub, Month, Year);
}
// Implement Conversion operator const char *
operator const char*() {
ostringstream formattedDate;
formattedDate << Day << "/" << Month << "/" << Year;
DateString = formattedDate.str();
return DateString.c_str();
}
void DisplayDate() {
cout << Day << "/" << Month << "/" << Year;
}
};
int main()
{
Date today(18, 5, 2017);
Date yesterday(today - 1);
// yesterday = today - 1;
cout << yesterday << endl;
/*
cout << "Today is on: " << today << endl;
// smart pointer
// supports automatic deallocation() , which means delete (in C++)
// Actually, delete implies free() in C language
smart_pointer<int> pDynamicAllocInteger(new int);
*pDynamicAllocInteger = 42;
cout << *pDynamicAllocInteger << endl;
// local variable => stack => automatically poped (removed) when main() returns
// The destructor is invoked automatically
// That's why it is called smart_pointer
// How can we verify this?
smart_pointer<Date> tomorrow(new Date(19, 5, 2017));
tomorrow->DisplayDate();
*/
return 0;
}
