Added thirdparty: boost library

thirdparty/include/boost/url/rfc/unreserved_chars.hpp

@@ -0,0 +1,55 @@
+//
+// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot 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/url
+//
+
+#ifndef BOOST_URL_RFC_UNRESERVED_CHARS_HPP
+#define BOOST_URL_RFC_UNRESERVED_CHARS_HPP
+
+#include <boost/url/detail/config.hpp>
+#include <boost/url/grammar/lut_chars.hpp>
+
+namespace boost {
+namespace urls {
+
+/** The unreserved character set
+
+    @par Example
+    Character sets are used with rules and
+    the functions @ref grammar::find_if and
+    @ref grammar::find_if_not.
+    @code
+    system::result< decode_view > rv = grammar::parse( "Program%20Files", pct_encoded_rule( unreserved_chars ) );
+    @endcode
+
+    @par BNF
+    @code
+    unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
+    @endcode
+
+    @par Specification
+    @li <a href="https://datatracker.ietf.org/doc/html/rfc3986#section-2.3"
+        >2.3. Unreserved Characters (rfc3986)</a>
+
+    @see
+        @ref grammar::find_if,
+        @ref grammar::find_if_not,
+        @ref grammar::parse,
+        @ref pct_encoded_rule.
+*/
+constexpr
+grammar::lut_chars
+unreserved_chars =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    "abcdefghijklmnopqrstuvwxyz"
+    "0123456789"
+    "-._~";
+
+} // urls
+} // boost
+
+#endif