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+/*
+ * Copyright 2009, Google Inc.
+ * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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.
+ */
+
+
+// This file declares STL functional classes in a cross-compiler way.
+
+#ifndef O3D_BASE_CROSS_STD_FUNCTIONAL_H_
+#define O3D_BASE_CROSS_STD_FUNCTIONAL_H_
+
+#include <build/build_config.h>
+
+#if defined(COMPILER_GCC)
+#include <ext/functional>
+namespace o3d {
+namespace base {
+using __gnu_cxx::select1st;
+using __gnu_cxx::select2nd;
+}  // namespace base
+}  // namespace o3d
+#elif defined(COMPILER_MSVC)
+#include <functional>
+#include <utility>
+namespace o3d {
+namespace base {
+
+template <class Pair>
+class select1st : public std::unary_function<Pair, typename Pair::first_type> {
+ public:
+  const result_type &operator()(const argument_type &value) const {
+    return value.first;
+  }
+};
+
+template <class Pair>
+class select2nd : public std::unary_function<Pair, typename Pair::second_type> {
+ public:
+  const result_type &operator()(const argument_type &value) const {
+    return value.second;
+  }
+};
+
+}  // namespace base
+}  // namespace o3d
+#else
+#error Unsupported compiler
+#endif
+
+#endif  // O3D_BASE_CROSS_STD_FUNCTIONAL_H_