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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Copyright (c) 1997
+ * Moscow Center for SPARC Technology
+ *
+ * Copyright (c) 1999
+ * Boris Fomitchev
+ *
+ * This material is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * Permission to use or copy this software for any purpose is hereby granted
+ * without fee, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ */
+
+/*
+ * Lifted and paraphrased from STLport - with additions from Fridrich
+ * Strba and Thorsten Behrens
+ */
+
+#ifndef INCLUDED_O3TL_COMPAT_FUNCTIONAL_HXX
+#define INCLUDED_O3TL_COMPAT_FUNCTIONAL_HXX
+
+#include <functional>
+
+namespace o3tl
+{
+
+/// Identity functor - return the input value
+template<class T>
+struct identity : public std::unary_function<T, T>
+{
+     T operator()(const T& y) const
+     {
+          return (y);
+     }
+};
+
+/// Functor, given two parameters, return the first
+template<class T1,class T2>
+struct project1st : public std::binary_function<T1, T2, T1>
+{
+    T1 operator()(const T1& y, const T2&) const
+    {
+        return (y);
+    }
+};
+
+/// Functor, given two parameters, return the second
+template<class T1,class T2>
+struct project2nd : public std::binary_function<T1, T2, T2>
+{
+    T2 operator()(const T1&, const T2& x) const
+    {
+        return (x);
+    }
+};
+
+/// Select first value of a pair
+template<class P>
+struct select1st : public std::unary_function<P, typename P::first_type>
+{
+    const typename P::first_type& operator()(const P& y) const
+    {
+        return (y.first);
+    }
+};
+
+/// Select second value of a pair
+template<class P>
+struct select2nd : public std::unary_function<P, typename P::second_type>
+{
+    const typename P::second_type& operator()(const P& y) const
+    {
+        return (y.second);
+    }
+};
+
+/// Call F1 with the result of F2 applied to the one input parameter
+template<class F1, class F2>
+class unary_compose : public std::unary_function<typename F2::argument_type, typename F1::result_type>
+{
+    public:
+        unary_compose(const F1& fnction1, const F2& fnction2) : ftor1(fnction1), ftor2(fnction2) {}
+
+        typename F1::result_type operator()(const typename F2::argument_type& y) const
+        {
+            return (ftor1(ftor2(y)));
+        }
+
+    protected:
+        F1 ftor1;
+        F2 ftor2;
+};
+
+/// Create functor that calls F1 with the result of F2 applied to the one input parameter
+template<class F1, class F2>
+inline unary_compose<F1, F2> compose1(const F1& fnction1, const F2& fnction2)
+{
+    return (unary_compose<F1, F2>(fnction1, fnction2));
+}
+
+/// Calls F2 and F3 for the two args of F1, respectively
+template<class F1, class F2, class F3>
+class binary_compose : public std::unary_function<typename F2::argument_type,typename F1::result_type>
+{
+    public:
+        binary_compose(const F1& fnction1, const F2& fnction2, const F3& fnction3) : ftor1(fnction1), ftor2(fnction2), ftor3(fnction3) {}
+
+        typename F1::result_type operator()(const typename F2::argument_type& y) const
+        {
+            return (ftor1(ftor2(y), ftor3(y)));
+        }
+
+    protected:
+        F1 ftor1;
+        F2 ftor2;
+        F3 ftor3;
+};
+
+/// Creates functor that calls F2 and F3 for the two args of F1, respectively
+template<class F1, class F2, class F3>
+inline binary_compose<F1, F2, F3> compose2(const F1& fnction1, const F2& fnction2, const F3& fnction3)
+{
+    return (binary_compose<F1, F2, F3>(fnction1, fnction2, fnction3));
+}
+
+/// Algo that assigns val, val+1, ... to the given range
+template<typename FwdIter, typename ValueType>
+inline void iota(FwdIter first, FwdIter last, ValueType val)
+{
+    while(first != last)
+        *first++ = val++;
+}
+
+}   // namespace o3tl
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */