Added thirdparty: boost library

thirdparty/include/boost/json/detail/digest.hpp

@@ -0,0 +1,42 @@
+//
+// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// Official repository: https://github.com/boostorg/json
+//
+
+#ifndef BOOST_JSON_DETAIL_DIGEST_HPP
+#define BOOST_JSON_DETAIL_DIGEST_HPP
+
+namespace boost {
+namespace json {
+namespace detail {
+
+// Calculate salted digest of string
+template<class ForwardIterator>
+std::size_t
+digest(
+    ForwardIterator b,
+    ForwardIterator e,
+    std::size_t salt) noexcept
+{
+#if BOOST_JSON_ARCH == 64
+    std::uint64_t const prime = 0x100000001B3ULL;
+    std::uint64_t hash  = 0xcbf29ce484222325ULL;
+#else
+    std::uint32_t const prime = 0x01000193UL;
+    std::uint32_t hash  = 0x811C9DC5UL;
+#endif
+    hash += salt;
+    for(; b != e; ++b)
+        hash = (*b ^ hash) * prime;
+    return hash;
+}
+
+} // detail
+} // namespace json
+} // namespace boost
+
+#endif