GlobalReleaseHook

GlobalReleaseHook -- a method name which is consulted when an assignment to a global variable occurs.

The method should be a function of two variables: the symbol to which a value is being assigned, and the old value about to be overwritten. The method should be stored under then name GlobalReleaseHook in the class of the old value.

     i1 = GlobalReleaseHook RR := (sym,val) -> << concatenate (
     
               	  "assigning ", name val, " to ", name sym
     
          	  ) << endl
     
     o1 = --function--
     
     o1 : Function

     i2 = a=4.5
     
     o2 = 4.5
     
     o2 : RR

     i3 = a=5.4
     
     assigning 4.5 to a
     o3 = 5.4
     
     o3 : RR