I know the norms' group but I don't agree. Why doesn't help him?
If you don't like off-topics threads, just don't read them. I think we
can learn from them too. Why no?
He is helping him, and others too. He helps the OP by telling him that
this is off topic in this group, so the next time the OP has a
question he/she can more easily decide if this group is appropriate or
not. Further he pointed the op to the library FAQ, which might help
the OP to find information that he/she needs. And third, he tells the
OP that it would be better to ask the question in a group specific for
his platform where more people with the knowledge he needs might be
found.
Further it helps others by keeping this group clean so that when you
or someone else have a C++ language question you can post it here
knowing that there are people reading and answering questions. If the
noise-ration is to high those experts who we depend on will go some
other place and it will be more difficult to get answers to our
questions.
And, by posting the question in the correct group the chance that
someone with the same problem will find an answered question by
searching increases.