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   On Thursday, June 13, 2013 7:50:42 AM UTC-6, Öö Tiib wrote:   
   > On Wednesday, 12 June 2013 15:50:59 UTC+3, Frank Bergemann  wrote:   
   > > Here's the final version - pls. see below. But it's just an example.   
   > > Maybe for other algorithms it will be more usable.   
   >   
   > IMO current model of requesting all information a function needs from   
   > caller by declaring explicit function parameters is cleaner and simpler   
   > to understand.   
   >   
   > That Dobbs article seemingly misses the point. Exceptions are necessary   
   > evil ... efficient way to deal with very rare concerns. Now if a function   
   > realizes that it can not do what it should because some access is not   
   > granted or keys are not authorized then it should either abort the   
   > program or throw exceptions or return error (depends on its contract   
   > requirements). Somehow hacking and repairing the situation by doing   
   > something that is far above its responsibilities is most evil thing to do   
   > because it results with spaghetti code that we all hate.   
      
   I am the author.  I agree that, like the exception mechanism,   
   retain/recall should only occasionally be used.  Named parameters or   
   instance data are typically better choices for getting information to   
   a method that needs it.  The point of the article was to define a grey   
   area between these choices, and global variables (essentially the only   
   other choice without retain/recall).  The example applications in the   
   code illustrate a group of problems where retain/recall significantly   
   simplifies solving certain reasonably common problems.   
      
      
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