X-Git-Url: https://git.dogcows.com/gitweb?p=chaz%2Fyoink;a=blobdiff_plain;f=src%2Fstlplus%2Fcontainers%2Ffoursome.tpp;h=79017b96f0693b2bca7ec55ed170e8250ab855e6;hp=f1dd9b39c66b2352352371e17e12f7474c2d8213;hb=4f6e4488a55f7e3ba3f7485d78177f793c0eab9a;hpb=6b0a0d0efafe34d48ab344fca3b479553bd4e62c

diff --git a/src/stlplus/containers/foursome.tpp b/src/stlplus/containers/foursome.tpp
index f1dd9b3..79017b9 100644
--- a/src/stlplus/containers/foursome.tpp
+++ b/src/stlplus/containers/foursome.tpp
@@ -2,7 +2,7 @@
 
 //   Author:    Andy Rushton, from an original by Dan Milton
 //   Copyright: (c) Southampton University 1999-2004
-//              (c) Andy Rushton           2004-2009
+//              (c) Andy Rushton           2004 onwards
 //   License:   BSD License, see ../docs/license.html
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -47,13 +47,26 @@ namespace stlplus
   bool operator == (const foursome<T1,T2,T3,T4>& left, const foursome<T1,T2,T3,T4>& right)
   {
     // foursomes are equal if all elements are equal
-    return 
-      left.first == right.first && 
-      left.second == right.second && 
+    return
+      left.first == right.first &&
+      left.second == right.second &&
       left.third == right.third &&
       left.fourth == right.fourth;
   }
 
+  template<typename T1, typename T2, typename T3, typename T4>
+  bool operator < (const foursome<T1,T2,T3,T4>& left, const foursome<T1,T2,T3,T4>& right)
+  {
+    // use the < operator on each element
+  	return left.first < right.first ? true :
+  	       right.first < left.first ? false :
+  	       left.second < right.second ? true :
+  	       right.second < left.second ? false :
+  	       left.third < right.third ? true :
+  	       right.third < left.third ? false :
+  	       left.fourth < right.fourth;
+  }
+
   ////////////////////////////////////////////////////////////////////////////////
 
 } // end namespace stlplus