R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> ## - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> ## Assert that auto delete works
> ## - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> 
> ## Temporary files before
> tfiles <- dir(path=tempdir(), full.names=TRUE)
> 
> ## Create temporary file on the fly without any references to it
> bfr <- readLines(tmpfile("Hello world!\n"))
> print(bfr)
[1] "Hello world!"
> 
> ## Find new temporary file
> tfile <- setdiff(dir(path=tempdir(), full.names=TRUE), tfiles)
> print(tfile)
[1] "D:\\temp\\RtmpwLgeJ3/file5d144188449f"
> stopifnot(file.exists(tfile))
> 
> ## The on-the-fly temporary file is removed
> ## whenever the garbage collector runs
> gc()
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 332523 17.8     632125 33.8   632125 33.8
Vcells 561060  4.3    8388608 64.0  1917758 14.7
> stopifnot(!file.exists(tfile))
> 
> proc.time()
   user  system elapsed 
   0.26    0.09    0.29