X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/blobdiff_plain/a39c3aa04022fc5209efa2ba36f3155d44fed25e..43ae41784d3ef4fe3ada6e9c2f24245b83b67691:/puzzles.h

diff --git a/puzzles.h b/puzzles.h
index 971cb29..48b5b1a 100644
--- a/puzzles.h
+++ b/puzzles.h
@@ -253,6 +253,9 @@ char *midend_get_game_id(midend *me);
 int midend_can_format_as_text_now(midend *me);
 char *midend_text_format(midend *me);
 char *midend_solve(midend *me);
+int midend_status(midend *me);
+int midend_can_undo(midend *me);
+int midend_can_redo(midend *me);
 void midend_supersede_game_desc(midend *me, char *desc, char *privdesc);
 char *midend_rewrite_statusbar(midend *me, char *text);
 void midend_serialise(midend *me,
@@ -345,6 +348,43 @@ void dsf_merge(int *dsf, int v1, int v2);
 void dsf_init(int *dsf, int len);
 
 /*
+ * tdq.c
+ */
+
+/*
+ * Data structure implementing a 'to-do queue', a simple
+ * de-duplicating to-do list mechanism.
+ *
+ * Specification: a tdq is a queue which can hold integers from 0 to
+ * n-1, where n was some constant specified at tdq creation time. No
+ * integer may appear in the queue's current contents more than once;
+ * an attempt to add an already-present integer again will do nothing,
+ * so that that integer is removed from the queue at the position
+ * where it was _first_ inserted. The add and remove operations take
+ * constant time.
+ *
+ * The idea is that you might use this in applications like solvers:
+ * keep a tdq listing the indices of grid squares that you currently
+ * need to process in some way. Whenever you modify a square in a way
+ * that will require you to re-scan its neighbours, add them to the
+ * list with tdq_add; meanwhile you're constantly taking elements off
+ * the list when you need another square to process. In solvers where
+ * deductions are mostly localised, this should prevent repeated
+ * O(N^2) loops over the whole grid looking for something to do. (But
+ * if only _most_ of the deductions are localised, then you should
+ * respond to an empty to-do list by re-adding everything using
+ * tdq_fill, so _then_ you rescan the whole grid looking for newly
+ * enabled non-local deductions. Only if you've done that and emptied
+ * the list again finding nothing new to do are you actually done.)
+ */
+typedef struct tdq tdq;
+tdq *tdq_new(int n);
+void tdq_free(tdq *tdq);
+void tdq_add(tdq *tdq, int k);
+int tdq_remove(tdq *tdq);        /* returns -1 if nothing available */
+void tdq_fill(tdq *tdq);         /* add everything to the tdq at once */
+
+/*
  * laydomino.c
  */
 int *domino_layout(int w, int h, random_state *rs);
@@ -476,6 +516,7 @@ struct game {
 			 game_ui *ui);
     float (*flash_length)(game_state *oldstate, game_state *newstate, int dir,
 			  game_ui *ui);
+    int (*status)(game_state *state);
     int can_print, can_print_in_colour;
     void (*print_size)(game_params *params, float *x, float *y);
     void (*print)(drawing *dr, game_state *state, int tilesize);