I’m trying to get the hang of basic OOP, so I made this pointless code as a startinbg point:
…more function declarations
When I try to compile it, it tells me that there are undefined references to rectangle::rectangle and rectangle::~rectangle. If I remove the constructor and destructor or include some code, it doesn’t make a fuss. I know they’re not necessary, but why is it doing this?
You declared them in the class definition but did not provide implementations. For the default implementation just remove the semi-colons at the end of the declarations and add
That defines an empty constructor and destructor inline but that is really all you need for now. Or you could define them outside the class declaration like so:
But in general this is a basic C++ question and doesn’t have as much to do with Haiku. But in the future I personally would like to see other languages (such as Ruby or Python) as first-class citizens when it comes to making simple Haiku apps. So one day you may not need to learn C++ to program Haiku. But that won’t be a reality for a while.
Thanks. I’ve been following darkwyrm’s tutorials, being more relevant to Haiku, and a widely used language. I believe he added the constructor as I did, so I didn’t really see how it went wrong, but this must have been an example of the theory, but code that doesn’t really work or do anything.