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I came across this piece of code and I don’t understand it:
catch (MyException & /* q */) {
What do the /* and */ do? They look like a comment to me but that can’t be right. Doesn’t a variable need to be specified?
Yes, these are C-style comments. They are used to exclude the name of an unused variable, most likely to avoid a warning from the compiler. You can read about them in a C or C++ book of your choice.