#' @param log.fun (`function` | `character(1)`)\cr
#' Function used for logging. If set to \dQuote{default} (the default), the evaluated design points, the resulting
#' performances, and the runtime will be reported.
#' If set to \dQuote{memory} the memory usage for each evaluation will also be displayed, with `character(1)` small increase
#' in run time.
#' Otherwise `character(1)` function with arguments `learner`, `resampling`, `measures`,
#' `par.set`, `control`, `opt.path`, `dob`, `x`, `y`, `remove.nas`,
#' `stage` and `prev.stage` is expected.
#' The default displays the performance measures, the time needed for evaluating,
#' the currently used memory and the max memory ever used before
#' (the latter two both taken from [gc]).
#' See the implementation for details.
#' @md
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