How does one "release" an object? What happens to other objects that retain references to those objects?
On Thu, Feb 4, 2016 at 4:35 PM, Michael Landis <[email protected]> wrote: > if you added a field, the existing objects could still be valid. If you > killed an attribute, they are invalid and can be released. > > On Thursday, February 4, 2016 at 10:55:25 AM UTC-8, Stefan Karpinski wrote: >> >> What happens to existing objects of a type when you redefine the type? >> >> On Thu, Feb 4, 2016 at 1:46 PM, Michael Landis <[email protected]> >> wrote: >> >>> I think it would be nice to be able to undefine a type, so restarting >>> the environment is not required when adding or deleting an attribute from a >>> type description. Not being able to update a type definition without >>> restarting the environment is a royal pain in the ass. >>> >>> >>> On Saturday, March 8, 2014 at 9:55:37 AM UTC-8, Freddy Chua wrote: >>>> >>>> Suppose I have a Type >>>> >>>> type Foo >>>> a >>>> b >>>> end >>>> >>>> f = Foo(1,2) >>>> f.a = 1 >>>> f.b = 2 >>>> >>>> how do I test whether f.a is defined >>>> I do this isdefined(f, 1) but isdefined(f, 'a') does not work >>>> >>>> another question >>>> how do i undefine f.a such that isdefined(f,1) now returns false >>>> >>> >>
