Rearrange sources

include/xrpl/beast/hash/uhash.h

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+//------------------------------------------------------------------------------
+/*
+    This file is part of Beast: https://github.com/vinniefalco/Beast
+    Copyright 2014, Howard Hinnant <howard.hinnant@gmail.com>,
+        Vinnie Falco <vinnie.falco@gmail.com
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef BEAST_HASH_UHASH_H_INCLUDED
+#define BEAST_HASH_UHASH_H_INCLUDED
+
+#include <ripple/beast/hash/hash_append.h>
+#include <ripple/beast/hash/xxhasher.h>
+
+namespace beast {
+
+// Universal hash function
+template <class Hasher = xxhasher>
+struct uhash
+{
+    explicit uhash() = default;
+
+    using result_type = typename Hasher::result_type;
+
+    template <class T>
+    result_type
+    operator()(T const& t) const noexcept
+    {
+        Hasher h;
+        hash_append(h, t);
+        return static_cast<result_type>(h);
+    }
+};
+
+}  // namespace beast
+
+#endif