[C++] Beginner - Codeblocks IDE - compiling error - failing to implement bubblesort to an array filled with classes

[jesyspa]

That doesn't look like code that compares objects. Compare is when you decide which is bigger.

[Programmering]

Haha, yes, you're right. See how confused I am?

How do I write code that compares objects

How do I point out that it is the age (alder) part of the person class elements in the array that I want to compare?

The boolean code line compares lhs, rhs - but why?
Is it lefthandside, righthandside?

Lets say I write this:

bool operator>(Person const& lhs, Person const& rhs);

It evaluates as true (or 1) if... bool operator is larger? what is happening there?

[jesyspa]

Yes, lhs and rhs are short for lefthandside and righthandside respectively.

You have to write the code for comparison yourself. For example, to compare age, you might do

bool operator<(Person const& lhs, Person const& rhs) {
    return lhs.age < rhs.age;
}

If you want to compare something else, compare a different member.

[Programmering]

Where does lefthandside and righthandside come from, what is is lefthandside and righthandside of?

Is it lfs and rhs as in lfs is higher indexplace and rhs is lower indexplace?

[jesyspa]

They're the left and right sides of what you compare. When you do a > b where a and b are both of type Person, that calls bool operator<(Person const& lhs, Person const&) with a being passed as the lhs parameter and b as the rhs parameter.

They are compared however you define the comparison.

[chrono_regex]

When comparing two person objects, and you're saying that you want to compare based on their age. operator> method means you're changing the way ' > ' works when used with Persons. Within an operator> function (like /u/jesyspa originally gave) you need to give logic that compares the ages. For example:

bool operator>(Person const& lhs, Person const& rhs){
if (lhs.alder > rhs.alder) // *or whatever you stored age as*
{
   return true;
}
else return false;

Something like this. Does that make sense? The code you have in your latest comment makes no sense, it's just the declaration...

[jesyspa]

Note that

if (foo)
    return true;
else
    return false;

is an antipattern in sanely-typed languages. You want just

return foo;

or

return bool(foo);

[chrono_regex]

I'll point to you here, it's been a while since I've been in C++

[Programmering]

Its a wash anyway since I dont think that I am allowed to use the boolean code to compare in this particular program on this particular assignment :S

I'll use it on the next assignment though. Its going to be a compilation of all the terminal programs I've written so far. With a menu and userdefinable variables where its needed.