Add the Room R6 class.

NAMESPACE

@@ -1,5 +1,6 @@
 # Generated by roxygen2: do not edit by hand
 
+export(Room)
 export(empty_cells)
 export(empty_room)
 export(is_maximal_proom)
@@ -8,3 +9,4 @@ export(is_room)
 export(n_filled_cells)
 export(unused_pairs)
 export(volume)
+importFrom(R6,R6Class)

R/room-class.R

@@ -0,0 +1,65 @@
+#' Create a Room square
+#' 
+#' @docType class
+#' @importFrom R6 R6Class
+#' 
+#' @param size the order of the Room square to be created
+#'
+#' @export
+#' @format An \code{\link{R6Class}} generator object
+Room <- R6::R6Class(
+  classname = "Room",
+  public = list(
+
+    size = NULL,
+    cells = NULL,
+    symbols = NULL,
+    free_pairs = NULL,
+    empty_cells = NULL,
+
+    initialize = function(size = NA) {
+
+      self$size <- size
+      self$symbols <- 0:(self$size - 1)
+
+      self$cells <- tidyr::expand_grid(row = 1:(self$size - 1), col = 1:(self$size - 1)) |>
+        dplyr::mutate(first = as.integer(NA), second = as.integer(NA)) |>
+        dplyr::mutate(avail = list(0:(self$size - 1)))
+
+      self$free_pairs <- all_pairs(self$size)
+      self$empty_cells <- all_ordered_pairs(self$size - 1)
+
+    },
+
+    set = function(e, p) {
+
+      self$cells[self$cells$row == e[1] & self$cells$col == e[2], "first"] <- p[1]
+      self$cells[self$cells$row == e[1] & self$cells$col == e[2], "second"] <- p[2]
+
+      self$cells[self$cells$row == e[1], "avail"]$avail <- lapply(self$cells[self$cells$row == e[1], "avail"]$avail, remove_both, p)
+      self$cells[self$cells$col == e[2], "avail"]$avail <- lapply(self$cells[self$cells$col == e[2], "avail"]$avail, remove_both, p)
+
+      self$free_pairs <- self$free_pairs[-match(list(p), self$free_pairs)]
+      self$empty_cells <- self$empty_cells[-match(list(e), self$empty_cells)]
+
+    },
+
+    is_available = function(e, p) {
+      p[1] %in% self$cells[self$cells$row == e[1] & self$cells$col == e[2], "avail"]$avail[[1]] && p[2] %in% self$cells[self$cells$row == e[1] & self$cells$col == e[2], "avail"]$avail[[1]]
+    }
+
+  ),
+  active = list(
+
+    n_filled = function() {
+      self$cells |>
+        dplyr::filter(!is.na(first)) |>
+        nrow()
+    },
+
+    volume = function() {
+      round(self$n_filled/choose(max(self$cells$col) + 1, 2), 6)
+    }
+
+  )
+)