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/*============================================================================= Copyright (c) 2001-2011 Hartmut Kaiser Copyright (c) 2001-2014 Joel de Guzman Copyright (c) 2013 Agustin Berge 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) ==============================================================================*/ #ifndef BOOST_SPIRIT_X3_ATTR_JUL_23_2008_0956AM #define BOOST_SPIRIT_X3_ATTR_JUL_23_2008_0956AM #include <boost/spirit/home/x3/core/parser.hpp> #include <boost/spirit/home/x3/support/unused.hpp> #include <boost/spirit/home/x3/support/traits/container_traits.hpp> #include <boost/spirit/home/x3/support/traits/move_to.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/type_traits/remove_cv.hpp> #include <boost/type_traits/remove_reference.hpp> #include <cstddef> #include <string> #include <utility> namespace boost { namespace spirit { namespace x3 { namespace detail { template <typename Value, std::size_t N , typename = std::make_index_sequence<N>> struct array_helper; template <typename Value, std::size_t N, std::size_t... Is> struct array_helper<Value, N, std::index_sequence<Is...>> { constexpr array_helper(Value const (&value)[N]) : value_{ value[Is]... } {} constexpr array_helper(Value (&&value)[N]) : value_{ static_cast<Value&&>(value[Is])... } {} // silence MSVC warning C4512: assignment operator could not be generated array_helper& operator= (array_helper const&) = delete; Value value_[N]; }; } template <typename Value> struct attr_parser : parser<attr_parser<Value>> { typedef Value attribute_type; static bool const has_attribute = !is_same<unused_type, attribute_type>::value; static bool const handles_container = traits::is_container<attribute_type>::value; constexpr attr_parser(Value const& value) : value_(value) {} constexpr attr_parser(Value&& value) : value_(std::move(value)) {} template <typename Iterator, typename Context , typename RuleContext, typename Attribute> bool parse(Iterator& /* first */, Iterator const& /* last */ , Context const& /* context */, RuleContext&, Attribute& attr_) const { // $$$ Change to copy_to once we have it $$$ traits::move_to(value_, attr_); return true; } Value value_; // silence MSVC warning C4512: assignment operator could not be generated attr_parser& operator= (attr_parser const&) = delete; }; template <typename Value, std::size_t N> struct attr_parser<Value[N]> : parser<attr_parser<Value[N]>> , detail::array_helper<Value, N> { using detail::array_helper<Value, N>::array_helper; typedef Value attribute_type[N]; static bool const has_attribute = !is_same<unused_type, attribute_type>::value; static bool const handles_container = true; template <typename Iterator, typename Context , typename RuleContext, typename Attribute> bool parse(Iterator& /* first */, Iterator const& /* last */ , Context const& /* context */, RuleContext&, Attribute& attr_) const { // $$$ Change to copy_to once we have it $$$ traits::move_to(this->value_ + 0, this->value_ + N, attr_); return true; } // silence MSVC warning C4512: assignment operator could not be generated attr_parser& operator= (attr_parser const&) = delete; }; template <typename Value> struct get_info<attr_parser<Value>> { typedef std::string result_type; std::string operator()(attr_parser<Value> const& /*p*/) const { return "attr"; } }; struct attr_gen { template <typename Value> constexpr attr_parser<typename remove_cv< typename remove_reference<Value>::type>::type> operator()(Value&& value) const { return { std::forward<Value>(value) }; } }; constexpr auto attr = attr_gen{}; }}} #endif
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