onGarbageCollect: Registers a function to be called when the R garbage collector
  is (detected to be) running
Description
Registers a function to be called when the R garbage collector
  is (detected to be) running.Usage
## S3 method for class 'default':
onGarbageCollect(fcn, action=c("prepend", "append", "replace"), ...)Arguments
fcn
A function to be called without argument. action
A character string specifying how the hook function is
   added to list of hooks. Value
- Returns (invisibly) the hooks successfully called.
Examples
Run this codeonGarbageCollect(function(...) {
    cat("The R garbage collector is running!\n");
  })
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