From af5c528f043f663b94ce197b0c70ddb3da9224e8 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Thu, 5 Apr 2012 02:00:34 +0000
Subject: [PATCH] use std::upper_bound in DisplayBuffer::atom_containing to run
 in O(log n)

---
 src/display_buffer.cc | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/src/display_buffer.cc b/src/display_buffer.cc
index 8f90901d8..133c843f7 100644
--- a/src/display_buffer.cc
+++ b/src/display_buffer.cc
@@ -1,6 +1,7 @@
 #include "display_buffer.hh"
 
 #include "assert.hh"
+#include <algorithm>
 
 namespace Kakoune
 {
@@ -92,12 +93,9 @@ DisplayBuffer::iterator DisplayBuffer::atom_containing(const BufferIterator& whe
 DisplayBuffer::iterator DisplayBuffer::atom_containing(const BufferIterator& where,
                                                        iterator start)
 {
-    for (iterator it = start; it != m_atoms.end(); ++it)
-    {
-        if (it->end() > where)
-            return it->begin() <= where ? it : end();
-    }
-    return end();
+    return std::upper_bound(start, end(), where,
+                            [](const BufferIterator& where, const DisplayAtom& atom)
+                            { return where < atom.end(); });
 }
 
 DisplayBuffer::iterator DisplayBuffer::split(iterator atom, const BufferIterator& pos)