reg.finalizer(..., add=FALSE)?

Is it possible to (i) clear or (ii) override already registered
finalizer functions, e.g. reg.finalizer(e, f, add=FALSE) cf.
on.exit(..., add=FALSE)?

Currently:
env <- new.env()
reg.finalizer(env, function(...) cat("Finalizer A!\n"))
NULL
reg.finalizer(env, function(...) cat("Finalizer B!\n"))
NULL
reg.finalizer(env, function(...) cat("Finalizer C!\n"))
NULL
gc()
used (Mb) gc trigger (Mb) max used (Mb)
Ncells 115827  3.1     350000  9.4   350000  9.4
Vcells  77109  0.6     786432  6.0   370917  2.9
rm(env)
gc()
Finalizer C!
Finalizer B!
Finalizer A!
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 115932  3.1     350000  9.4   350000  9.4
Vcells  77648  0.6     786432  6.0   370917  2.9

I wish to have only finalizer "C" to run.

/Henrik
Is it possible to (i) clear or (ii) override already registered
finalizer functions, e.g. reg.finalizer(e, f, add=FALSE) cf.
on.exit(..., add=FALSE)?
No, but you can have the finalizer function call something else, and 
change the thing it calls.  E.g.

reg.finalizer(env, function (...) CleanUp(...))

will call CleanUp in the global environment (the environment of the 
anonymous finalizer); change that function and the cleanup behaviour 
will change.

Duncan Murdoch
Currently:

env <- new.env()
reg.finalizer(env, function(...) cat("Finalizer A!\n"))
NULL
reg.finalizer(env, function(...) cat("Finalizer B!\n"))
NULL
reg.finalizer(env, function(...) cat("Finalizer C!\n"))
NULL
gc()
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 115827  3.1     350000  9.4   350000  9.4
Vcells  77109  0.6     786432  6.0   370917  2.9
rm(env)
gc()
Finalizer C!
Finalizer B!
Finalizer A!
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 115932  3.1     350000  9.4   350000  9.4
Vcells  77648  0.6     786432  6.0   370917  2.9

I wish to have only finalizer "C" to run.

/Henrik

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