| /*============================================================================= |
| Copyright (c) 2001-2014 Joel de Guzman |
| |
| 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) |
| ==============================================================================*/ |
| #if !defined(BOOST_SPIRIT_X3_REAL_APRIL_18_2006_0850AM) |
| #define BOOST_SPIRIT_X3_REAL_APRIL_18_2006_0850AM |
| |
| #include <boost/spirit/home/x3/core/parser.hpp> |
| #include <boost/spirit/home/x3/core/skip_over.hpp> |
| #include <boost/spirit/home/x3/numeric/real_policies.hpp> |
| #include <boost/spirit/home/x3/support/numeric_utils/extract_real.hpp> |
| |
| namespace boost { namespace spirit { namespace x3 |
| { |
| template <typename T, typename RealPolicies = real_policies<T> > |
| struct real_parser : parser<real_parser<T, RealPolicies> > |
| { |
| typedef T attribute_type; |
| static bool const has_attribute = true; |
| |
| constexpr real_parser() |
| : policies() {} |
| |
| constexpr real_parser(RealPolicies const& policies) |
| : policies(policies) {} |
| |
| template <typename Iterator, typename Context> |
| bool parse(Iterator& first, Iterator const& last |
| , Context const& context, unused_type, T& attr_) const |
| { |
| x3::skip_over(first, last, context); |
| return extract_real<T, RealPolicies>::parse(first, last, attr_, policies); |
| } |
| |
| template <typename Iterator, typename Context, typename Attribute> |
| bool parse(Iterator& first, Iterator const& last |
| , Context const& context, unused_type, Attribute& attr_param) const |
| { |
| // this case is called when Attribute is not T |
| T attr_; |
| if (parse(first, last, context, unused, attr_)) |
| { |
| traits::move_to(attr_, attr_param); |
| return true; |
| } |
| return false; |
| } |
| |
| RealPolicies policies; |
| }; |
| |
| typedef real_parser<float> float_type; |
| constexpr float_type float_ = {}; |
| |
| typedef real_parser<double> double_type; |
| constexpr double_type double_ = {}; |
| |
| typedef real_parser<long double> long_double_type; |
| constexpr long_double_type long_double = {}; |
| |
| }}} |
| |
| #endif |