Patch for "bind" egg: support for modern C++ nested namespace definition and scoped enums

[Florian Keßeler]

Hi all,

I hope this is the right place to send this to, but here we go. For our 
project, we wanted support for some modern C++-features in the "bind" egg:

1. nested namespace definitions: instead of namespace A { namespace B {
   ... } }, C++17 allows writing namespace A::B { ... }
2. typed and scoped enums: C++11 allows specifying the underlying type
   of an enum: enum C: int16_t { ... }. It also added scoped enums,
   that put all enumerators into a new scope: enum class D { E, F },
   which then need to be referenced as D::E and D::F.

Since bind is a thin layer over some basic C and C++ constructs and 
mostly ignores namespaces, I've extended it to accept nested namespace 
definitions and scoped and typed enums. The underlying type for the 
latter are simply ignored by bind as well.

These changes would really help reusing declarations between C++ code 
called by CHICKEN and bindings automatically generated with the bind 
module and chicken-bind CLI tools.

Disclaimer: Even though I have almost 20 years of professional coding 
experience, I'm still pretty new to both Scheme and Lisp in general. 
Feedback of any kind is welcome!


Cheers
- rnlf

chicken-bind-nested-namespaces-scoped-enums.patch
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