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