Cascading member function calls with the this pointer : this « Class « C++ Tutorial

1. C++ Tutorial
2. Class
3. this

#include <iostream>
using std::cout;
using std::endl;

#include <iomanip>
using std::setfill;
using std::setw;

class Time 
{
public:
   Time( int = 0, int = 0, int = 0 );

   Time &setTime( int, int, int );
   Time &setHour( int );
   Time &setMinute( int );
   Time &setSecond( int );

   int getHour() const;
   int getMinute() const;
   int getSecond() const;

   void printUniversal() const;
private:
   int hour;
   int minute;
   int second;
};

Time::Time( int hr, int min, int sec ) 
{ 
   setTime( hr, min, sec ); 
}
Time &Time::setTime( int h, int m, int s )
{
   setHour( h );
   setMinute( m );
   setSecond( s ); 
   return *this;
}
Time &Time::setHour( int h )
{
   hour = h;
   return *this; 
}

Time &Time::setMinute( int m )
{
   minute = m;
   return *this;
}

Time &Time::setSecond( int s )
{
   second = s;
   return *this;
}

int Time::getHour() const 
{ 
   return hour; 
}

int Time::getMinute() const 
{ 
   return minute; 
}

int Time::getSecond() const 
{ 
   return second; 
}

void Time::printUniversal() const
{
   cout << hour << ":" << minute << ":" << second;
}

int main()
{
   Time t;
   t.setHour( 18 ).setMinute( 30 ).setSecond( 22 );

   t.printUniversal();

   t.setTime( 20, 20, 20 ).printUniversal();
   cout << endl;
   return 0;
}

18:30:2220:20:20