What is a non-trivial destructor in C++?

Question

I was reading this which mentions destructors being trivial and non-trivial.

A class has a non-trivial destructor if it either has an explicitly def

Answer 1

I think in general it refers to a destructor that actually does something such as:

• Release memory
• Close a connection to database
• Or take care of any resource that needs to be released

In this case the destructor does nothing. According to the description, technically it may be 'non-trivial' because it defines a constructor, but it matters not, since it does nothing anyway.