R Under development (unstable) (2025-02-23 r87804 ucrt) -- "Unsuffered Consequences"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> 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 v1.27.0 (2024-11-01 18:00:02 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 v2.13.0 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, use, 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\\2025_02_24_21_20_16_28386\\RtmpchjwRL/file2a3837458a3"
> 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 349950 18.7     629540 33.7   629540 33.7
Vcells 597063  4.6    8388608 64.0  2038263 15.6
> stopifnot(!file.exists(tfile))
> 
> proc.time()
   user  system elapsed 
   0.15    0.07    0.21