How much functionality is “acceptable” for a C++ struct?

Question

My first post so please go easy on me!

I know that there\'s no real difference between structs and classes in C++, but a lot of people including me use a struct or class

Answer 1

I'll add a very few methods to a struct, as a matter of convenience, only if I'm actually using them. Of course all of them are public. If I need any more than this, it immediately gets converted to a class.

1. A default constructor, to initialize the data members to known values.
2. A constructor with one parameter for each member.
3. operator<, for easy inclusion in sets and maps.
4. operator==.