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74 lines
2.2 KiB
74 lines
2.2 KiB
// Copyright (c) 2001-2011 Hartmut Kaiser |
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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(BOOST_SPIRIT_KARMA_AS_STRING_DEC_18_0644PM) |
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#define BOOST_SPIRIT_KARMA_AS_STRING_DEC_18_0644PM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/support/unused.hpp> |
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#include <boost/spirit/home/support/attributes_fwd.hpp> |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// This file contains the attribute to string conversion utility. The |
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// utility provided also accept spirit's unused_type; all no-ops. Compiler |
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// optimization will easily strip these away. |
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/////////////////////////////////////////////////////////////////////////// |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename T, typename Attribute> |
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inline typename spirit::result_of::attribute_as<T, Attribute>::type |
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as(Attribute const& attr) |
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{ |
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return attribute_as<T, Attribute>::call(attr); |
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} |
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template <typename T> |
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inline unused_type as(unused_type) |
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{ |
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return unused; |
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} |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename T, typename Attribute> |
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inline bool valid_as(Attribute const& attr) |
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{ |
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return attribute_as<T, Attribute>::is_valid(attr); |
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} |
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template <typename T> |
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inline bool valid_as(unused_type) |
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{ |
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return true; |
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} |
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}}} |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { namespace spirit { namespace result_of |
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{ |
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template <typename T, typename Attribute> |
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struct attribute_as |
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: traits::attribute_as<T, Attribute> |
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{}; |
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template <typename T> |
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struct attribute_as<T, unused_type> |
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{ |
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typedef unused_type type; |
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}; |
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template <typename T> |
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struct attribute_as<T, unused_type const> |
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{ |
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typedef unused_type type; |
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}; |
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}}} |
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#endif
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