// 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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