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1 /*=============================================================================
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2 Copyright (c) 2001-2014 Joel de Guzman
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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 #if !defined(BOOST_SPIRIT_X3_REAL_APRIL_18_2006_0850AM)
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8 #define BOOST_SPIRIT_X3_REAL_APRIL_18_2006_0850AM
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9
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10 #include <boost/spirit/home/x3/core/parser.hpp>
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11 #include <boost/spirit/home/x3/core/skip_over.hpp>
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12 #include <boost/spirit/home/x3/numeric/real_policies.hpp>
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13 #include <boost/spirit/home/x3/support/numeric_utils/extract_real.hpp>
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14
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15 namespace boost { namespace spirit { namespace x3
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16 {
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17 template <typename T, typename RealPolicies = real_policies<T> >
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18 struct real_parser : parser<real_parser<T, RealPolicies> >
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19 {
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20 typedef T attribute_type;
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21 static bool const has_attribute = true;
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22
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23 real_parser()
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24 : policies() {}
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25
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26 real_parser(RealPolicies const& policies)
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27 : policies(policies) {}
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28
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29 template <typename Iterator, typename Context>
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30 bool parse(Iterator& first, Iterator const& last
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31 , Context& context, unused_type, T& attr_) const
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32 {
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33 x3::skip_over(first, last, context);
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34 return extract_real<T, RealPolicies>::parse(first, last, attr_, policies);
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35 }
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36
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37 template <typename Iterator, typename Context, typename Attribute>
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38 bool parse(Iterator& first, Iterator const& last
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39 , Context& context, unused_type, Attribute& attr_param) const
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40 {
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41 // this case is called when Attribute is not T
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42 T attr_;
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43 if (parse(first, last, context, unused, attr_))
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44 {
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45 traits::move_to(attr_, attr_param);
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46 return true;
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47 }
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48 return false;
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49 }
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50
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51 RealPolicies policies;
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52 };
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53
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54 typedef real_parser<float> float_type;
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55 float_type const float_ = {};
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56
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57 typedef real_parser<double> double_type;
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58 double_type const double_ = {};
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59
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60 }}}
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61
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62 #endif
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