pce<-answer_stack

pce <-answer_stack_size: -> cells=int

Statistics on the incremental garbage collection system. Objects created that are not related to any other object are pushed on the answer stack. They are deleted from this stack iff

They are related to another object
They are object->lock_objected (or given a named reference)
The answer-stack is rewinded to a point before the creation of the object.
Both event-call-back and the execution of a PCE method mark and rewind this stack. Thus
```
?- new(X, point).
```
Creates a point and leaves it on the answer-stack, while
```
?- [user].
create_point :- new(X, point).
^D
?- send(@prolog, create_point).
```
Creates a point, pushes it on the answer-stack. Then rewinds this stack on exit of the host->create_point, garbage collection the point object. Thus
```
?- pceusage(send(@prolog, create_point)).
```

00 seconds, 0 bytes, 1 created - 1 freed = 0 objects NOTE: pceusage/1 should often be called twice to get the intended result. The first call may create objects in the XPCE/Prolog cache.