53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
// Copyright (c) 2010 Olaf Peter
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// Copyright (c) 2001-2010 Hartmut Kaiser
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/karma.hpp>
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#include <boost/detail/lightweight_test.hpp>
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namespace client
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{
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namespace karma = boost::spirit::karma;
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template <typename OutputIterator>
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struct grammar
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: karma::grammar<OutputIterator, boost::optional<double>()>
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{
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grammar()
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: grammar::base_type(start)
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{
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using karma::double_;
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u = double_ << "U";
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start = ( !double_ << "NA" ) | u;
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start.name("start");
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u.name("u");
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}
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karma::rule<OutputIterator, double()> u;
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karma::rule<OutputIterator, boost::optional<double>()> start;
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};
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}
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int main()
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{
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namespace karma = boost::spirit::karma;
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typedef std::back_insert_iterator<std::string> sink_type;
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boost::optional<double> d1, d2;
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d2 = 1.0;
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std::string generated1, generated2;
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client::grammar<sink_type> g;
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BOOST_TEST(karma::generate(sink_type(generated1), g, d1) && generated1 == "NA");
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BOOST_TEST(karma::generate(sink_type(generated2), g, d2) && generated2 == "1.0U");
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return boost::report_errors();
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}
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