From 187a99aba28929780ee9b79cb53f3bd5c6914876 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Sat, 15 Oct 2011 04:42:28 +0000
Subject: [PATCH] LineAndColumn: add comparison operators

---
 src/line_and_column.hh | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/line_and_column.hh b/src/line_and_column.hh
index 8c8c1603..17e4e8d2 100644
--- a/src/line_and_column.hh
+++ b/src/line_and_column.hh
@@ -27,15 +27,34 @@ struct LineAndColumn
 
     EffectiveType operator-(const EffectiveType& other) const
     {
-        return EffectiveType(line + other.line, column + other.column);
+        return EffectiveType(line - other.line, column - other.column);
     }
 
     EffectiveType& operator-=(const EffectiveType& other)
     {
-        line   += other.line;
-        column += other.column;
+        line   -= other.line;
+        column -= other.column;
         return *static_cast<EffectiveType*>(this);
     }
+
+    bool operator< (const EffectiveType& other) const
+    {
+        if (line != other.line)
+            return line < other.line;
+        return column < other.column;
+    }
+
+    bool operator<= (const EffectiveType& other) const
+    {
+        if (line != other.line)
+            return line < other.line;
+        return column <= other.column;
+    }
+
+    bool operator== (const EffectiveType& other) const
+    {
+        return line == other.line and column == other.column;
+    }
 };
 
 }