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#' Return the next permutation of the multiset
#'
#' This function returns the next permuation of the multiset if there is one.
#' \code{initMC} called before \code{nextPerm} can be called.
#'
#'
#' @param mcObj an S3 object of class \code{mc} which must be created with
#' \code{initMC}
#' @return either a vector with the next permutation of the multiset or
#' \code{FALSE} when all permutations have been returned
#' @author James M. Curran
#' @seealso nextPerm
#' @examples
#'
#' x = c(1,1,2,2)
#' m1 = initMC(x)
#'
#' for(i in 1:6){
#' cat(paste(paste(nextPerm(m1),collapse=","),"\n"))
#' }
#'
#' ## an example with letters
#' x = letters[1:4]
#' m2 = initMC(x)
#' nextPerm(m2)
#' nextPerm(m2)
#' ## and so on
#'
#' @export nextPerm
nextPerm = function(mcObj){
r = mcObj$mc$nextPerm()
if(r$b){
return(mcObj$elements[r$set])
}else{
return(FALSE)
}
}
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