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1 | /*============================================================================= |
2 | Copyright (c) 2001-2014 Joel de Guzman | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | ==============================================================================*/ | |
7 | #if !defined(BOOST_SPIRIT_X3_REAL_APRIL_18_2006_0850AM) | |
8 | #define BOOST_SPIRIT_X3_REAL_APRIL_18_2006_0850AM | |
9 | ||
10 | #include <boost/spirit/home/x3/core/parser.hpp> | |
11 | #include <boost/spirit/home/x3/core/skip_over.hpp> | |
12 | #include <boost/spirit/home/x3/numeric/real_policies.hpp> | |
13 | #include <boost/spirit/home/x3/support/numeric_utils/extract_real.hpp> | |
14 | ||
15 | namespace boost { namespace spirit { namespace x3 | |
16 | { | |
17 | template <typename T, typename RealPolicies = real_policies<T> > | |
18 | struct real_parser : parser<real_parser<T, RealPolicies> > | |
19 | { | |
20 | typedef T attribute_type; | |
21 | static bool const has_attribute = true; | |
22 | ||
23 | real_parser() | |
24 | : policies() {} | |
25 | ||
26 | real_parser(RealPolicies const& policies) | |
27 | : policies(policies) {} | |
28 | ||
29 | template <typename Iterator, typename Context> | |
30 | bool parse(Iterator& first, Iterator const& last | |
31 | , Context& context, unused_type, T& attr_) const | |
32 | { | |
33 | x3::skip_over(first, last, context); | |
34 | return extract_real<T, RealPolicies>::parse(first, last, attr_, policies); | |
35 | } | |
36 | ||
37 | template <typename Iterator, typename Context, typename Attribute> | |
38 | bool parse(Iterator& first, Iterator const& last | |
39 | , Context& context, unused_type, Attribute& attr_param) const | |
40 | { | |
41 | // this case is called when Attribute is not T | |
42 | T attr_; | |
43 | if (parse(first, last, context, unused, attr_)) | |
44 | { | |
45 | traits::move_to(attr_, attr_param); | |
46 | return true; | |
47 | } | |
48 | return false; | |
49 | } | |
50 | ||
51 | RealPolicies policies; | |
52 | }; | |
53 | ||
54 | typedef real_parser<float> float_type; | |
55 | float_type const float_ = {}; | |
56 | ||
57 | typedef real_parser<double> double_type; | |
58 | double_type const double_ = {}; | |
59 | ||
60 | }}} | |
61 | ||
62 | #endif |