From: gah@ugcs.caltech.edu   
      
   Michiel wrote:   
   (snip)   
      
   > If it cannot be a an r-value, it is a writeonly expression. This is seen   
   > less often, but can occur for formal parameters of the 'out' direction. (As   
   > opposed to 'in' or 'inout'.) Or for properties that have a setter method   
   > but no getter method.   
      
   I believe for Fortran INTENT(OUT) dummy variables, you must   
   write first, but you can then read the value just as any other   
   variable.  They are not write-only.   
      
   Among other reasons, Fortran allows either call by reference   
   or call by value result (sometimes called copy-in copy-out).   
   In the latter case, INTENT(OUT) might not do the copy in.   
   It can also affect the way the optimizer works.   
      
   -- glen   
      
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