The problem with the separation is mainly with making changes to code, not with reading the code as it currently exists. This problem is avoided at no cost in

The problem with the separation is mainly with making changes to code, not with reading the code as it currently exists. This problem is avoided at no cost in Go, where an external tool can be used to get the same concise view of all of the function types that you like, without needing to manually create and update header files.