src/sn_comparator.[ch]: Add a user data member.

[sort-networks.git] / src / sn_comparator.h

diff --git a/src/sn_comparator.h b/src/sn_comparator.h
index db46982..6e3f7f5 100644 (file)
--- a/src/sn_comparator.h
+++ b/src/sn_comparator.h
@@ -35,6 +35,8 @@ struct sn_comparator_s
 {
   int min; /**< Index of the line onto which the smaller element will be put. */
   int max; /**< Index of the line onto which the larger element will be put. */
+  void *user_data; /**< Pointer to user data. */
+  void (*free_func) (void *); /**< Pointer to a function used to free the user data pointer. */
 };
 typedef struct sn_comparator_s sn_comparator_t;
 
@@ -47,6 +49,11 @@ typedef struct sn_comparator_s sn_comparator_t;
 /** Returns the index of the line onto which the larger element will be put. */
 #define SN_COMP_MAX(c) (c)->max
 
+/** Expands to the user data pointer. */
+#define SN_COMP_USER_DATA(c) (c)->user_data
+/** Expands to the free-function pointer. */
+#define SN_COMP_FREE_FUNC(c) (c)->free_func
+
 /**
  * Allocates, initializes and returns a new comparator object. The returned
  * pointer must be freed by sn_comparator_destroy().