Added thirdparty: boost library

thirdparty/include/boost/url/grammar/alnum_chars.hpp

@@ -0,0 +1,93 @@
+//
+// Copyright (c) 2021 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_GRAMMAR_ALNUM_CHARS_HPP
+#define BOOST_URL_GRAMMAR_ALNUM_CHARS_HPP
+
+#include <boost/url/detail/config.hpp>
+#include <boost/url/grammar/detail/charset.hpp>
+
+namespace boost {
+namespace urls {
+namespace grammar {
+
+/** The set of letters and digits
+
+    @par Example
+    Character sets are used with rules and the
+    functions @ref find_if and @ref find_if_not.
+    @code
+    system::result< core::string_view > = parse( "Johnny42", token_rule( alnumchars ) );
+    @endcode
+
+    @par BNF
+    @code
+    ALNUM       = ALPHA / DIGIT
+
+    ALPHA       = %x41-5A / %x61-7A
+                ; A-Z / a-z
+
+    DIGIT       = %x30-39
+                ; 0-9
+    @endcode
+
+    @par Specification
+    @li <a href="https://datatracker.ietf.org/doc/html/rfc5234#appendix-B.1"
+        >B.1. Core Rules (rfc5234)</a>
+
+    @see
+        @ref find_if,
+        @ref find_if_not,
+        @ref parse,
+        @ref token_rule.
+*/
+#ifdef BOOST_URL_DOCS
+constexpr __implementation_defined__ alnum_chars;
+#else
+struct alnum_chars_t
+{
+    constexpr
+    bool
+    operator()(char c) const noexcept
+    {
+        return
+            (c >= '0' && c <= '9') ||
+            (c >= 'A' && c <= 'Z') ||
+            (c >= 'a' && c <= 'z');
+    }
+
+#ifdef BOOST_URL_USE_SSE2
+    char const*
+    find_if(
+        char const* first,
+        char const* last) const noexcept
+    {
+        return detail::find_if_pred(
+            *this, first, last);
+    }
+
+    char const*
+    find_if_not(
+        char const* first,
+        char const* last) const noexcept
+    {
+        return detail::find_if_not_pred(
+            *this, first, last);
+    }
+#endif
+};
+
+constexpr alnum_chars_t alnum_chars{};
+#endif
+
+} // grammar
+} // urls
+} // boost
+
+#endif