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Operator Overloading C++

Can someone explain a real world example where I would need to overload an operator? Can you please also explain to me what exactly overloading sn operator is?

16th Apr 2018, 12:04 PM
S-J
S-J - avatar
7 Respuestas
+ 7
To overload an operator, you need a class that has data that makes sense to have an overloaded operator. A good example would be implementing a bigger integer than 'long long'. You could implement it as a string with values 0 to 9 in the characters using a -1 as the sign bit. Ignoring the class structure and methods for the moment lets you do this: class mylong {} result, first, second; result = first + second; In mylong, you would declare the operator+ method, which would loop through the strings adding digits.
16th Apr 2018, 2:17 PM
John Wells
John Wells - avatar
+ 4
Sandin Jayasekera you're welcome. If I had a decent example, I'd show you. But, mine are in Python and Kotlin only.
16th Apr 2018, 3:00 PM
John Wells
John Wells - avatar
+ 3
Sandin Jayasekera I converted my Kotlin example to C++. It isn't a good class example as there is no reason for it to exist except to play with operators. However, it demonstrates all integer math operations. https://code.sololearn.com/cStdw0OPtPxG
16th Apr 2018, 6:07 PM
John Wells
John Wells - avatar
+ 1
John Wells I'm going to have to do some more research on this topic, I still have trouble understanding what exactly overloading an operator means... thanks for the help though.
16th Apr 2018, 2:53 PM
S-J
S-J - avatar
+ 1
Operator overload: Let‚Äôs say you have a class with X and Y coordinates. With an object of this class, I‚Äôd like to plot the next point in a line that runs 45 degrees from the X axis. This means I need to increase both my X value and my Y value by 1. I could write a function, or if I plan to do it multiple places, I could override the increment operator. This is pseudo code because I haven‚Äôt been in c++ for 20 years and I am no longer familiar with the syntax Declare a new instance of the class Point called myPoint; myPoint.X=1; myPoint.Y=1; myPoint.print ;//(class method to display the plotted point on a graph on the screen) //Prints a Point 2 step diagonally up to the right from the cross-hairs myPoint++; //overloaded operator execute the equivalent of myPoint.X= myPoint.X+1; myPoint.Y= myPoint.Y +1; myPoint.Print; //Prints a Point 2 step diagonally up to the right from the cross-hairs Now let‚Äôs declare a new instance of Point called ‚Äėtarget‚Äô target.X=2; target.Y=2; If (myPoint == target ) then cout << ‚ÄúIt‚Äôs a hit‚ÄĚ //this won‚Äôt function as you would like, unless you overload the ‚Äė==‚Äė operator to check if each X value of the two objects are equal and if the two Y values of the object are equal. Let me know if I can provide any more clarification.
19th Apr 2018, 10:56 AM
SQrL
SQrL - avatar
0
Aidos Zhakupov I can't really understand that, could you please explain it in idiot terms? I'm pretty new to this.
16th Apr 2018, 12:27 PM
S-J
S-J - avatar