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Diffstat (limited to 'src/boost/libs/spirit/example/x3/attributes/tuple.cpp')
-rw-r--r-- | src/boost/libs/spirit/example/x3/attributes/tuple.cpp | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/boost/libs/spirit/example/x3/attributes/tuple.cpp b/src/boost/libs/spirit/example/x3/attributes/tuple.cpp new file mode 100644 index 000000000..979127a7c --- /dev/null +++ b/src/boost/libs/spirit/example/x3/attributes/tuple.cpp @@ -0,0 +1,51 @@ + +/*============================================================================= + Copyright (c) 2019 Tom Tan + + 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) +=============================================================================*/ +#include <boost/config/warning_disable.hpp> +#include <boost/spirit/home/x3.hpp> + +#include <boost/fusion/adapted/std_tuple.hpp> + +#include <iostream> +#include <tuple> +#include <string> + +// +// X3 does not support more than one attribute anymore in the parse function, +// this example show how to wrap multiple attributes into one leveraging std::tuple. +// + +std::tuple<uint32_t, uint32_t, uint32_t> parse_message_prefix_revision(const std::string &s) +{ + + namespace x3 = boost::spirit::x3; + + auto const uint_3_digits = x3::uint_parser<std::uint32_t, 10, 3, 3>{}; + auto const uint_4_digits = x3::uint_parser<std::uint32_t, 10, 4, 4>{}; + + auto iter = s.cbegin(); + auto end_iter = s.cend(); + + std::tuple<uint32_t, uint32_t, uint32_t> length_id_revision; + + x3::parse(iter, end_iter, + uint_4_digits >> uint_4_digits >> uint_3_digits, + length_id_revision); + + return length_id_revision; +} + +int main() +{ + std::string s = "00200060001"; + + std::cout << "parsing " << s << '\n'; + auto [len, id, rev] = parse_message_prefix_revision(s); + std::cout << "length = " << len << '\n' + << "id = " << id << '\n' + << "revision =" << rev; +}
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