1 files changed, 71 insertions, 0 deletions
diff --git a/kpat/freecell-solver/pqueue.h b/kpat/freecell-solver/pqueue.h
new file mode 100644
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+++ b/kpat/freecell-solver/pqueue.h
@@ -0,0 +1,71 @@
+/*
+    pqueue.h - header file for the priority queue implementation.
+
+    Originally written by Justin-Heyes Jones
+    Modified by Shlomi Fish, 2000
+
+    This file is in the public domain (it's uncopyrighted).
+
+    Check out Justin-Heyes Jones' A* page from which this code has
+    originated:
+        http://www.geocities.com/jheyesjones/astar.html
+*/
+
+#ifndef FC_SOLVE__PQUEUE_H
+#define FC_SOLVE__PQUEUE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <limits.h>
+
+#include "jhjtypes.h"
+
+#define PQUEUE_MaxRating INT_MAX
+
+typedef int32 pq_rating_t;
+
+typedef struct struct_pq_element_t
+{
+    void * item;
+    pq_rating_t rating;
+} pq_element_t;
+
+typedef struct _PQUEUE
+{
+    int32 MaxSize;
+    int32 CurrentSize;
+    pq_element_t * Elements; /* pointer to void pointers */
+    pq_rating_t MaxRating; /* biggest element possible */
+} PQUEUE;
+
+/* given an index to any element in a binary tree stored in a linear array with the root at 1 and
+   a "sentinel" value at 0 these macros are useful in making the code clearer */
+
+/* the parent is always given by index/2 */
+#define PQ_PARENT_INDEX(i) ((i)>>1)
+#define PQ_FIRST_ENTRY (1)
+
+/* left and right children are index * 2 and (index * 2) +1 respectively */
+#define PQ_LEFT_CHILD_INDEX(i) ((i)<<1)
+#define PQ_RIGHT_CHILD_INDEX(i) (((i)<<1)+1)
+
+void freecell_solver_PQueueInitialise(
+    PQUEUE *pq,
+    int32 MaxElements
+    );
+
+void freecell_solver_PQueueFree( PQUEUE *pq );
+
+int freecell_solver_PQueuePush( PQUEUE *pq, void *item, pq_rating_t);
+
+void *freecell_solver_PQueuePop( PQUEUE *pq);
+
+#define PGetRating(elem) ((elem).rating)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifdef FC_SOLVE__PQUEUE_H */