llx: New function llx_find() to find a pointer in a list.

[pspp-builds.git] / src / libpspp / llx.h

diff --git a/src/libpspp/llx.h b/src/libpspp/llx.h
index 6232f3967ce3bdd9b9495bbf0cf0fc3a34934a6f..2aa18e7ba5694bced71cbe32a3feb69700e23f9b 100644 (file)
--- a/src/libpspp/llx.h
+++ b/src/libpspp/llx.h
@@ -110,6 +110,12 @@ struct llx_list
     struct ll_list ll_list;     /* The list. */
   };
 
+/* Suitable for use as the initializer for a `struct llx_list'
+   named LIST.  Typical usage:
+       struct llx_list list = LLX_INITIALIZER (list);
+   LLX_INITIALIZER() is an alternative to llx_init(). */
+#define LLX_INITIALIZER(LIST) { LL_INITIALIZER ((LIST).ll_list) }
+
 /* Memory manager. */
 struct llx_manager
   {
@@ -180,6 +186,8 @@ size_t llx_remove_if (struct llx *r0, struct llx *r1,
                       const struct llx_manager *);
 
 /* Non-mutating algorithms. */
+struct llx *llx_find (const struct llx *r0, const struct llx *r1,
+                      const void *target);
 struct llx *llx_find_equal (const struct llx *r0, const struct llx *r1,
                             const void *target,
                             llx_compare_func *, void *aux);