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#' @title
#' Construct a selection operator.
#'
#' @description
#' Helper function which defines a selector method, i. e., an operator which
#' takes the population and returns a part of it for mating or survival.
#'
#' @param selector [\code{function}]\cr
#' Actual selection operator.
#' @param supported [\code{character}]\cr
#' Vector of strings/names of supported parameter representations. Possible choices:
#' \dQuote{permutation}, \dQuote{float}, \dQuote{binary} or \dQuote{custom}.
#' @param supported.objectives [\code{character}]\cr
#' At least one of \dQuote{single-objective} or \dQuote{multi-objective}.
#' @param supported.opt.direction [\code{character(1-2)}]\cr
#' Does the selector work for maximization tasks xor minimization tasks or both?
#' Default is \dQuote{\code{minimize}}, which means that the selector selects
#' in favour of low fitness values.
#' @return [\code{ecr_selector}]
#' Selector object.
#' @export
makeSelector = function(
selector,
supported = getAvailableRepresentations(),
supported.objectives,
supported.opt.direction = "minimize") {
assertFunction(selector, args = c("fitness", "n.select"), ordered = TRUE)
assertSubset(supported.objectives, c("single-objective", "multi-objective"))
assertChoice(supported.opt.direction, choices = c("maximize", "minimize"))
selector = makeOperator(selector, supported)
selector = setAttribute(selector, "supported.objectives", supported.objectives)
selector = setAttribute(selector, "supported.opt.direction", supported.opt.direction)
selector = addClasses(selector, c("ecr_selector"))
return(selector)
}
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