From: brangdon@cix.compulink.co.uk   
      
   daniel.kruegler@googlemail.com (Daniel Krügler) wrote (abridged):   
   > I would like to know whether there are C++ projects or maybe   
   > use-cases out in the wild that have been found useful   
   > applications for the existing language support of pre- and   
   > post-increment on bool values,   
   > [...]   
   > If anyone feels that this removal would break relevant code or   
   > idioms, please respond to this query.   
      
   What about:   
      
        void demo() {   
            static bool done = false;   
            if (!done++)   
                do_once();   
        }   
      
   The idea being that do_once() is invoked the first time demo() is called   
   and not subsequence times.   
      
   I have not seen this in real code. Personally I'd write:   
      
        void demo() {   
            static bool done = false;   
            if (!done) {   
                done = true;   
                do_once();   
            }   
        }   
      
   This is 2 lines longer, but the other relies on obscure semantics.   
      
   -- Dave Harris, Nottingham, UK.   
      
      
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