X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftally%2Ftally.h;h=e7157175075cb556d2ff7cd5c74d07b95ee3fd3d;hp=1f4b5d5f7576f89673a59ec78a45606ad9220691;hb=d1cea3ebf96f61b5bbac1e74975700770e06add6;hpb=7a36f69eea4ee572bdf191d6048350751cd2ab5b

diff --git a/ccan/tally/tally.h b/ccan/tally/tally.h
index 1f4b5d5f..e7157175 100644
--- a/ccan/tally/tally.h
+++ b/ccan/tally/tally.h
@@ -10,9 +10,11 @@ struct tally;
  *
  * This allocates a tally structure using malloc().  The greater the value
  * of @buckets, the more accurate tally_approx_median() and tally_approx_mode()
- * and tally_graph() will be, but more memory is consumed.
+ * and tally_histogram() will be, but more memory is consumed.  If you want
+ * to use tally_histogram(), the optimal bucket value is the same as that
+ * @height argument.
  */
-struct tally *tally_new(size_t buckets);
+struct tally *tally_new(unsigned int buckets);
 
 /**
  * tally_add - add a value.
@@ -51,6 +53,17 @@ ssize_t tally_max(const struct tally *tally);
  */
 ssize_t tally_mean(const struct tally *tally);
 
+/**
+ * tally_total - the total value passed to tally_add.
+ * @tally: the tally structure.
+ * @overflow: the overflow value (or NULL).
+ *
+ * If your total can't overflow a ssize_t, you don't need @overflow.
+ * Otherwise, @overflow is the upper ssize_t, and the return value should
+ * be treated as the lower size_t (ie. the sign bit is in @overflow).
+ */
+ssize_t tally_total(const struct tally *tally, ssize_t *overflow);
+
 /**
  * tally_approx_median - the approximate median value passed to tally_add.
  * @tally: the tally structure.