| 1 | // Copyright (c) 2010 Olaf Peter |
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| 2 | // Copyright (c) 2001-2010 Hartmut Kaiser |
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| 3 | // |
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | |
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| 7 | #include <boost/spirit/include/karma.hpp> |
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| 8 | |
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| 9 | #include <boost/core/lightweight_test.hpp> |
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| 10 | |
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| 11 | namespace client |
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| 12 | { |
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| 13 | namespace karma = boost::spirit::karma; |
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| 14 | |
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| 15 | template <typename OutputIterator> |
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| 16 | struct grammar |
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| 17 | : karma::grammar<OutputIterator, boost::optional<double>()> |
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| 18 | { |
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| 19 | grammar() |
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| 20 | : grammar::base_type(start) |
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| 21 | { |
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| 22 | using karma::double_; |
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| 23 | |
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| 24 | u = double_ << "U" ; |
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| 25 | start = ( !double_ << "NA" ) | u; |
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| 26 | |
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| 27 | start.name("start" ); |
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| 28 | u.name("u" ); |
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| 29 | } |
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| 30 | |
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| 31 | karma::rule<OutputIterator, double()> u; |
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| 32 | karma::rule<OutputIterator, boost::optional<double>()> start; |
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| 33 | }; |
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| 34 | } |
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| 35 | |
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| 36 | int main() |
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| 37 | { |
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| 38 | namespace karma = boost::spirit::karma; |
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| 39 | |
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| 40 | typedef std::back_insert_iterator<std::string> sink_type; |
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| 41 | |
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| 42 | boost::optional<double> d1, d2; |
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| 43 | d2 = 1.0; |
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| 44 | |
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| 45 | std::string generated1, generated2; |
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| 46 | client::grammar<sink_type> g; |
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| 47 | |
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| 48 | BOOST_TEST(karma::generate(sink_type(generated1), g, d1) && generated1 == "NA" ); |
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| 49 | BOOST_TEST(karma::generate(sink_type(generated2), g, d2) && generated2 == "1.0U" ); |
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| 50 | |
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| 51 | return boost::report_errors(); |
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| 52 | } |
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| 53 | |
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