| 1 | #include <boost/config/warning_disable.hpp>
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| 2 | #include <boost/spirit/include/karma.hpp>
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| 3 | #include <boost/spirit/include/karma_real.hpp>
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| 4 |
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| 5 | #include <iostream>
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| 6 | #include <string>
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| 7 | #include <iterator>
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| 8 |
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| 9 | namespace karma = boost::spirit::karma;
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| 10 |
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| 11 | // define a new real number formatting policy
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| 12 | template <typename Num>
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| 13 | struct scientific_policy : karma::real_policies<Num>
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| 14 | {
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| 15 | // we want the numbers always to be in scientific format
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| 16 | static int floatfield(Num n) { return std::ios_base::scientific; }
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| 17 | };
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| 18 |
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| 19 | int main( ) {
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| 20 | // define a new generator type based on the new policy
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| 21 | typedef
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| 22 | karma::real_generator<double, scientific_policy<double> > science_type;
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| 23 | science_type const scientific = science_type();
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| 24 |
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| 25 | std::string output;
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| 26 | typedef std::back_insert_iterator<std::string> output_iterator;
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| 27 | output_iterator sink( output );
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| 28 |
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| 29 | // should output: 1.0e-01, but will output: 10.0e-02
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| 30 | karma::generate(sink, scientific, 0.1);
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| 31 |
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| 32 | std::cout << output << std::endl;
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| 33 | };
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