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+/* -*- c++ -*- */
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef ANDROID_ASTL_FUNCTIONAL__
+#define ANDROID_ASTL_FUNCTIONAL__
+
+#if defined(_T) || defined(_Arg) || defined(_Arg1) || defined(_Arg2) || \
+    defined(_Result) || defined(_Name) || defined(_Op)
+#error "Macro(s) already defined."
+#endif
+
+namespace std {
+
+template <class _Arg, class _Result>
+struct unary_function {
+    typedef _Arg    argument_type;
+    typedef _Result result_type;
+};
+
+template <class _Arg1, class _Arg2, class _Result>
+struct binary_function {
+    typedef _Arg1   first_argument_type;
+    typedef _Arg2   second_argument_type;
+    typedef _Result result_type;
+};
+
+// Comparaison
+
+#define FUNCTIONAL_BINARY_COMPARAISON(_Name, _Op)              \
+    template <typename _T>                                     \
+    struct _Name : public binary_function<_T, _T, bool>        \
+    {                                                          \
+        bool operator()(const _T& left, const _T& right) const \
+        { return left _Op right; }                             \
+    };
+
+FUNCTIONAL_BINARY_COMPARAISON(equal_to, ==)
+FUNCTIONAL_BINARY_COMPARAISON(not_equal_to, !=)
+FUNCTIONAL_BINARY_COMPARAISON(greater, >)
+FUNCTIONAL_BINARY_COMPARAISON(less, <)
+FUNCTIONAL_BINARY_COMPARAISON(greater_equal, >=)
+FUNCTIONAL_BINARY_COMPARAISON(less_equal, <=)
+
+}  // namespace std
+
+#endif  // ANDROID_ASTL_FUNCTIONAL__