Rule of 3 for a simple class...

[jlou]

what exactly is the rule of three? I can't google a satisfying explanation ;-)

If any one of the compiler-generated destructor, copy constructor or copy assignment operator are inappropriate for a class, then it is likely that all three will compiler-generated functions will be inappropriate. The writer of the class would then be required to write their own or disable them.

Note that in modern C++ with the use of other classes that manage resources themselves it is less likely that the rule of three will apply to a well-written class.