1 files changed, 62 insertions, 0 deletions
diff --git a/src/jit/jitstd/functional.h b/src/jit/jitstd/functional.h
new file mode 100644
index 0000000000..31456a870e
--- /dev/null
+++ b/src/jit/jitstd/functional.h
@@ -0,0 +1,62 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+
+
+#pragma once
+
+namespace jitstd
+{
+
+template <typename T>
+void swap(T& a, T& b)
+{
+    T t(a);
+    a = b;
+    b = t;
+}
+
+template <typename Arg, typename Result>
+struct unary_function
+{
+    typedef Arg argument_type;
+    typedef Result result_type;
+};
+
+template <typename Arg1, typename Arg2, typename Result>
+struct binary_function
+{
+    typedef Arg1 first_argument_type;
+    typedef Arg2 second_argument_type;
+    typedef Result result_type;
+};
+
+template <typename T>
+struct greater : binary_function<T, T, bool>
+{
+    bool operator()(const T& lhs, const T& rhs) const
+    {
+        return lhs > rhs;
+    }
+};
+
+template <typename T>
+struct equal_to : binary_function<T, T, bool>
+{
+    bool operator()(const T& lhs, const T& rhs) const
+    {
+        return lhs == rhs;
+    }
+};
+
+template <typename T>
+struct identity : unary_function<T, T>
+{
+    const T& operator()(const T& op) const
+    {
+        return op;
+    }
+};
+
+} // end of namespace jitstd.