On Fri, Jan 13, 2012 at 6:12 AM, William Dunlap <wdun...@tibco.com> wrote:
> You could put your debug-only code into a function calls like
> ifDebug(diagnosticPlot(c))
> and
> ifDebug({
> tmp <- timeConsumingFunction(c)
> stopifnot(tmp < 1.0)
> })
> When you want debug output define ifDebug as
> ifDebug <- function(expr) force(expr)
> and when you don't want it define it as
> ifDebug <- function(expr) NULL
> Because of lazy evaluation, the expression won't get evaluated
> in the latter case.
>
This is a nice solution, for the question as posted.
For other uses of #ifdef, it might be worth noting that it is less
tolerant of syntax errors than #ifdef is, since the expression has to
parse, not just tokenize.
-thomas
--
Thomas Lumley
Professor of Biostatistics
University of Auckland
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