X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftalloc%2Ftalloc.h;h=b1b5e9ac461836737fed14a2a97f77c67d68af2d;hp=5263b9fed269261f833b2e9d55765a7242ca964b;hb=ecea073699c60fd5aab9e3955f59a7042d637b68;hpb=c520b4adbbfba5a663b94e71216b90eddd0bf877

diff --git a/ccan/talloc/talloc.h b/ccan/talloc/talloc.h
index 5263b9fe..b1b5e9ac 100644
--- a/ccan/talloc/talloc.h
+++ b/ccan/talloc/talloc.h
@@ -252,7 +252,7 @@ int talloc_free(const void *ptr);
  *	b = talloc_array(a, unsigned int, 100);
  *
  * See Also:
- *	talloc, talloc_zero_array
+ *	talloc, talloc_zero_array, talloc_array_length
  */
 #define talloc_array(ctx, type, count) (type *)_talloc_array(ctx, sizeof(type), count, #type)
 
@@ -276,7 +276,7 @@ int talloc_free(const void *ptr);
  */
 #define talloc_size(ctx, size) talloc_named_const(ctx, size, __location__)
 
-#ifdef HAVE_TYPEOF
+#if HAVE_TYPEOF
 /**
  * talloc_steal - change/set the parent context of a talloc pointer
  * @ctx: the new parent
@@ -936,12 +936,25 @@ void talloc_enable_leak_report_full(void);
 void *talloc_autofree_context(void);
 
 /**
- * talloc_get_size - get the size of an allocation
+ * talloc_array_length - get the number of elements in a talloc array
+ * @p: the talloc pointer whose allocation to measure.
+ *
+ * This assumes that @p has been allocated as the same type.  NULL returns 0.
+ *
+ * See Also:
+ *	talloc_get_size
+ */
+#define talloc_array_length(p) (talloc_get_size(p) / sizeof((*p)))
+
+/**
+ * talloc_get_size - get the requested size of an allocation
  * @ctx: the talloc pointer whose allocation to measure.
  *
  * This function lets you know the amount of memory alloced so far by this
- * context. It does NOT account for subcontext memory.  This can be used to
- * calculate the size of an array.
+ * context. It does NOT account for subcontext memory.
+ *
+ * See Also:
+ *	talloc_array_length
  */
 size_t talloc_get_size(const void *ctx);