fzort: Your mistake was fourfold. First, using StudlyCaps names rots the brain. Second, even thinking about Singleton rots the brain. Third, the visible presence of keyword "delete" usually indicates bad design. Finally, class hierarchies are an optimization step; first code without. The biggest difference between writing a program well in C++ and in "straight C" is in how expressively powerful are the libraries you have access to.

The place where you code very differently in C++ vs. C is in libraries. Of course any big enough program will have parts that increasingly resemble libraries, but programs don't start out big.