Question

Is there a way to force a class/enum to only be accessible in the same file, similar to how static functions/variables behave?

// free-floating static function
// basically I want similar access restrictions on helper-type classes/enums
static void func(void)
{
}

// this is a compiler error
static class A
{
};

Answer 1

A class declared inside an Unnamed namespace is what you want:

namespace
{

class SomeClass { };

}

This will be named mangled in such a way by the compiler that it is inaccessible outside of that translation unit.