From: pdjpurchase@googlemail.com   
      
   On Mar 11, 7:15 pm, noitalmost  wrote:   
   > I was thinking of something like:   
   > pure function foo(x,y : int) int   
   > begin   
   > ...   
   > end;   
   >   
   > Then foo isn't allowed to modify its parameters or to reference   
   > (except possibly through a parameter) or modify any non-local   
   > variables. ...   
      
   This has been added as a non standard extension to C in gcc, so it is   
   doable.  I think it is useful, since you don't have to use it if your   
   don't want to.   
      
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