[R] an assert() function

Greg Minshall minshall at umich.edu
Tue Feb 12 15:11:56 CET 2013

hi.  i've looked for (and not found) an assert() function.  needing one,
i created the following (from stop()).  i'm posting it in case 1)
someone sees a problem with this; and 2) someone else has a need.

cheers, Greg
## an assert mechanism...
assert <- function (shouldbe, ...) {
  if (!shouldbe) {
                   .makeMessage("assertion failure: ", ..., domain = NULL)))

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