1 // Copyright (c) 2010 Olaf Peter
2 // Copyright (c) 2001-2010 Hartmut Kaiser
3 //
4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6
7 #include <boost/config/warning_disable.hpp>
8 #include <boost/spirit/include/karma.hpp>
9 #include <boost/detail/lightweight_test.hpp>
10
11 namespace client
12 {
13 namespace karma = boost::spirit::karma;
14
15 template <typename OutputIterator>
16 struct grammar
17 : karma::grammar<OutputIterator, boost::optional<double>()>
18 {
grammarclient::grammar19 grammar()
20 : grammar::base_type(start)
21 {
22 using karma::double_;
23
24 u = double_ << "U";
25 start = ( !double_ << "NA" ) | u;
26
27 start.name("start");
28 u.name("u");
29 }
30
31 karma::rule<OutputIterator, double()> u;
32 karma::rule<OutputIterator, boost::optional<double>()> start;
33 };
34 }
35
main()36 int main()
37 {
38 namespace karma = boost::spirit::karma;
39
40 typedef std::back_insert_iterator<std::string> sink_type;
41
42 boost::optional<double> d1, d2;
43 d2 = 1.0;
44
45 std::string generated1, generated2;
46 client::grammar<sink_type> g;
47
48 BOOST_TEST(karma::generate(sink_type(generated1), g, d1) && generated1 == "NA");
49 BOOST_TEST(karma::generate(sink_type(generated2), g, d2) && generated2 == "1.0U");
50
51 return boost::report_errors();
52 }
53