From 786522358706ab2bebba77cce38131d599b7e881 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Tue, 26 Feb 2013 14:05:51 +0100
Subject: [PATCH] Add utf8::character_start function

---
 src/utf8.hh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/utf8.hh b/src/utf8.hh
index 1d26a7e2..7b247092 100644
--- a/src/utf8.hh
+++ b/src/utf8.hh
@@ -81,6 +81,15 @@ bool is_character_start(Iterator it)
     return (*it & 0xC0) != 0x80;
 }
 
+// returns an iterator to the first byte of the character it is into
+template<typename Iterator>
+Iterator character_start(Iterator it)
+{
+    while (not is_character_start(it))
+        --it;
+    return it;
+}
+
 namespace InvalidBytePolicy
 {