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108 lines
3.5 KiB
108 lines
3.5 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
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// Copyright (c) 2001-2011 Joel de Guzman |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#if !defined(SPIRIT_KARMA_DETAIL_ATTRIBUTES_APR_18_2010_0453PM) |
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#define SPIRIT_KARMA_DETAIL_ATTRIBUTES_APR_18_2010_0453PM |
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#include <boost/spirit/home/karma/domain.hpp> |
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#include <boost/spirit/home/support/attributes_fwd.hpp> |
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#include <boost/spirit/home/support/attributes.hpp> |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace karma |
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{ |
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template <typename Exposed, typename Transformed, typename Enable = void> |
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struct transform_attribute |
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{ |
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typedef Transformed type; |
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static Transformed pre(Exposed& val) |
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{ |
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return Transformed(traits::extract_from<Transformed>(val, unused)); |
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} |
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// Karma only, no post() and no fail() required |
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}; |
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template <typename Exposed, typename Transformed> |
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struct transform_attribute<boost::optional<Exposed> const, Transformed |
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, typename disable_if<is_same<boost::optional<Exposed>, Transformed> >::type> |
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{ |
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typedef Transformed const& type; |
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static Transformed const& pre(boost::optional<Exposed> const& val) |
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{ |
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return boost::get<Transformed>(val); |
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} |
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}; |
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template <typename Attribute> |
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struct transform_attribute<Attribute const, Attribute> |
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{ |
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typedef Attribute const& type; |
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static Attribute const& pre(Attribute const& val) { return val; } |
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// Karma only, no post() and no fail() required |
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}; |
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// reference types need special handling |
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template <typename Exposed, typename Transformed> |
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struct transform_attribute<Exposed&, Transformed> |
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: transform_attribute<Exposed, Transformed> |
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{}; |
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template <typename Exposed, typename Transformed> |
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struct transform_attribute<Exposed const&, Transformed> |
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: transform_attribute<Exposed const, Transformed> |
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{}; |
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template <typename Attribute> |
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struct transform_attribute<Attribute const&, Attribute> |
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: transform_attribute<Attribute const, Attribute> |
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{}; |
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// unused_type needs some special handling as well |
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template <> |
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struct transform_attribute<unused_type, unused_type> |
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{ |
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typedef unused_type type; |
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static unused_type pre(unused_type) { return unused; } |
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}; |
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template <> |
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struct transform_attribute<unused_type const, unused_type> |
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: transform_attribute<unused_type, unused_type> |
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{}; |
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template <typename Attribute> |
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struct transform_attribute<unused_type, Attribute> |
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: transform_attribute<unused_type, unused_type> |
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{}; |
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template <typename Attribute> |
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struct transform_attribute<unused_type const, Attribute> |
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: transform_attribute<unused_type, unused_type> |
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{}; |
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template <typename Attribute> |
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struct transform_attribute<Attribute, unused_type> |
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: transform_attribute<unused_type, unused_type> |
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{}; |
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template <typename Attribute> |
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struct transform_attribute<Attribute const, unused_type> |
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: transform_attribute<unused_type, unused_type> |
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{}; |
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}}} |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace traits |
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{ |
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template <typename Exposed, typename Transformed> |
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struct transform_attribute<Exposed, Transformed, karma::domain> |
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: karma::transform_attribute<Exposed, Transformed> |
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{}; |
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}}} |
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#endif |
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