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# @description
# Returns the names of all params which are required by the given Param or ParamSet.
# @template arg_par_or_set
# @return [\code{character}]: names of parameters which are required
getRequiredParamNames = function(par) {
UseMethod("getRequiredParamNames")
}
getRequiredParamNames.Param = function(par) {
all.vars(par$requires)
}
getRequiredParamNames.ParamSet = function(par) {
if (isEmpty(par))
return(character(0L))
unique(unlist(lapply(par$pars, getRequiredParamNames.Param), use.names = FALSE))
}
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