What is the name of the approach with ErrorCollector-s?

I have written code with C++ for the last five years. And pretty often, I see something like a class ErrorCollector. The first I saw it using boost::asio. After that, I saw it at GLUT. And today, I saw it again in my work code.

I know what it is and understand how it works. I want to see the name of this approach\mechanism.

Thank you very much in advance!

I tried to ask this question to our Senior team members. But nobody knows the name of it.

Also, of course, I tried to google. The same result.