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   comp.lang.forth      Forth programmers eat a lot of Bratwurst      117,951 messages   

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   Message 117,037 of 117,951   
   Ruvim to dxf   
   Re: Back & Forth - Co-routines   
   01 Feb 25 15:19:21   
   
   From: ruvim.pinka@gmail.com   
      
   On 2025-01-31 11:33, dxf wrote:   
   >   
   > Not sure if previously mentioned but here's another version of LOCAL   
   >   
   > : ;:  >r ;   
   >   
   > : LOCAL ( x adr -- )   
   >    r> -rot dup @ over 2>r ! ;: 2r> ! ;   
   >   
   > variable A  variable B  8 a !  7 b !   
   >   
   > : divide ( a b -- )  b local  a local   
   >    a @  b @  /  . cr  ;   
   >   
   > 15 3 divide  a ? b ?   
   >   
      
      
   This approach does not work well with catch/throw. Because `throw` must   
   restore the values of all "local" variables that are used in the   
   definitions whose execution is being terminated. And this is difficult   
   to implement.   
      
      
   See also 13.3.3.1, item c,   
      
      
   | ABORT shall release all local storage resources,   
   | and CATCH / THROW (if implemented) shall release   
   | such resources for all definitions whose execution   
   | is being terminated.   
      
      
   --   
   Ruvim   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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