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- // Copyright (c) 2010 Lars Kielhorn
- // Copyright (c) 2001-2010 Hartmut Kaiser
- //
- // 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/detail/lightweight_test.hpp>
- #include <boost/spirit/include/karma.hpp>
- #include <iostream>
- #include <string>
- #include <iterator>
- namespace karma = boost::spirit::karma;
- // define a new real number formatting policy
- template <typename Num>
- struct scientific_policy : karma::real_policies<Num>
- {
- // we want the numbers always to be in scientific format
- static int floatfield(Num) { return std::ios_base::scientific; }
- };
- int main()
- {
- // define a new generator type based on the new policy
- typedef karma::real_generator<double, scientific_policy<double> >
- science_type;
- science_type const scientific = science_type();
-
- std::string output;
- typedef std::back_insert_iterator<std::string> output_iterator;
- output_iterator sink(output);
-
- // should output: 1.0e-01, but will output: 10.0e-02
- BOOST_TEST(karma::generate(sink, scientific, 0.1) && output == "1.0e-01");
- return boost::report_errors();
- }
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