Is there a null value for std :: thread :: id?

Question

I would like to have a member of a class like std::thread::id , where I can also nullify it and then check if it has been installed.

What is the best way to “zero out” this type and then check if it has been installed?

Answer 1

According to cppreference in std :: thread :: id (default constructor) :

By default, a new stream identifier is created. The identifier does not represent a stream.

So you can store and compare with the default built std::thread::id .