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diff --git a/common/utility/pless.H b/common/utility/pless.H
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+// Copyright 2008, 2009 Brady J. Garvin
+
+// This file is part of Covering Arrays by Simulated Annealing (CASA).
+
+// CASA is free software: you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// CASA is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with CASA.  If not, see <http://www.gnu.org/licenses/>.
+
+
+#ifndef PLESS_H
+#define PLESS_H
+
+// Compares two pointers by the objects they point to.  Returns true if
+// dereferenced left is less than dereferenced right.
+
+template<class T>class pless {
+public:
+  bool operator ()(const T*left, const T*right) const {
+    return *left < *right;
+  }
+};
+
+#endif