What is the (searchable) name for this syntax...?

typedef std::function<bool(int)> MyFunction;

That bool(int) template argument notation syntax - does it have a name? I tried to read C++ standard about this syntax and did not know what to search for.

Obviously, using it in other contexts seems to fail.

typedef bool(int) MyFunctionType; // does not work.

So I assume there is a special chapter about this syntax somewhere...

Thanks.