| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2019 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_PSEUDO_ATTRIBUTE_OF_MAY_15_2019_1012PM) |
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| 8 | #define BOOST_SPIRIT_X3_PSEUDO_ATTRIBUTE_OF_MAY_15_2019_1012PM |
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| 9 | |
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| 10 | #include <utility> |
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| 11 | |
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| 12 | namespace boost { namespace spirit { namespace x3 { namespace traits |
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| 13 | { |
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| 14 | /////////////////////////////////////////////////////////////////////////// |
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| 15 | // Pseudo attributes are placeholders for parsers that can only know |
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| 16 | // its actual attribute at parse time. This trait customization point |
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| 17 | // provides a mechanism to convert the trait to the actual trait at |
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| 18 | // parse time. |
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| 19 | /////////////////////////////////////////////////////////////////////////// |
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| 20 | template <typename Context, typename Attribute, typename Iterator |
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| 21 | , typename Enable = void> |
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| 22 | struct pseudo_attribute |
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| 23 | { |
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| 24 | using attribute_type = Attribute; |
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| 25 | using type = Attribute; |
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| 26 | |
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| 27 | static type&& call(Iterator&, Iterator const&, attribute_type&& attribute) |
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| 28 | { |
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| 29 | return std::forward<type>(attribute); |
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| 30 | } |
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| 31 | }; |
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| 32 | }}}} |
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| 33 | |
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| 34 | #endif |
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| 35 | |
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