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

Question

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.

Answer 1

I don't know of a common name for this. In the standard, it's called a type-id, after its grammar production.

The type-id bool(int) names the type "function of (int) returning bool".

It doesn't work with typedef (which uses the normal declaration syntax instead), but alias declared with using does use a type-id:

using MyFunctionType = bool(int);