diff --git a/Makefile.am b/Makefile.am
index 5ef85581..b86f0816 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -117,6 +117,8 @@ UTIL_FILES = \
types.hpp \
types/bits.hpp \
types/casts.hpp \
+ types/comparator.hpp\
+ types/comparator.ipp\
types/string.cpp \
types/string.hpp \
types/traits.hpp \
diff --git a/types/comparator.hpp b/types/comparator.hpp
new file mode 100644
index 00000000..160748a0
--- /dev/null
+++ b/types/comparator.hpp
@@ -0,0 +1,35 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim 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.
+ *
+ * libgim 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 libgim. If not, see .
+ *
+ * Copyright 2012 Danny Robson
+ */
+
+#ifndef __UTIL_TYPES_COMPARATOR_HPP
+#define __UTIL_TYPES_COMPARATOR_HPP
+
+#include
+
+namespace util {
+ template
+ struct pointer_comparator {
+ bool operator() (const std::unique_ptr &lhs, const std::unique_ptr &rhs);
+ bool operator() (const T *lhs, const std::unique_ptr &rhs);
+ bool operator() (const std::unique_ptr &lhs, const T *rhs);
+ };
+}
+
+#include "util/types/comparator.ipp"
+#endif
diff --git a/types/comparator.ipp b/types/comparator.ipp
new file mode 100644
index 00000000..388a1f9e
--- /dev/null
+++ b/types/comparator.ipp
@@ -0,0 +1,49 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim 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.
+ *
+ * libgim 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 libgim. If not, see .
+ *
+ * Copyright 2012 Danny Robson
+ */
+
+#ifdef __UTIL_TYPES_COMPARATOR_IPP
+#error "Double inclusion for util/types/comparator.ipp"
+#endif
+
+#define __UTIL_TYPES_COMPARATOR_IPP
+
+
+//-----------------------------------------------------------------------------
+namespace util {
+ template
+ bool
+ pointer_comparator::operator() (const std::unique_ptr &lhs,
+ const std::unique_ptr &rhs)
+ { return lhs < rhs; }
+
+
+ template
+ bool
+ pointer_comparator::operator() (const T *lhs,
+ const std::unique_ptr &rhs)
+ { return lhs < rhs.get (); }
+
+
+ template
+ bool
+ pointer_comparator::operator() (const std::unique_ptr &lhs,
+ const T *rhs)
+ { return lhs.get () < rhs; }
+}
+