[abecedarius]

Fair. I think of DSLs as a way of thinking about the program you want to write; if a scheme is realizable with few compromises in an existing language, it can still be considered "DSL style". SICP calls this style "stratified design".

[UncleEntity]

You can do all sorts of “stratified design” with C++ templates which I assume is underneath the covers of this system. boost::spirit is probably the most excessive use of this that I’ve seen so far.