This is exactly what I do at Planimeter, where we use primarily ANSI C and convert compilation units to C++ when we need to interface with existing solutions.

This is exactly what I do at Planimeter, where we use primarily ANSI C and convert compilation units to C++ when we need to interface with existing solutions. This is the easiest way we can automate bindings to other programming languages without having to use larger instrumentation like SWIG. It's definitely not the industry standard recommendation I wrote about above, but internally we have other objectives that make it sensible. And we still get to use C++.