@fferen, @jlarocco, @Mon_Ouie, @deckiedan: I know you can probably set up all you need within the blink of a second (using emacs or vim or a template setup). Actually I'm so hooked on this idea I even wrote my own rake based C/C++ Buildsystem (https://github.com/marcmo/cxxproject). But still sometimes I prefer not having to set up anything and not having to clean up anything after I end my experiments. ... Idea - drop into REPL and try out - exit - done.