49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
// 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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#ifndef BOOST_SPIRIT_SUPPORT_AUXILIARY_ATTR_CAST_HPP
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#define BOOST_SPIRIT_SUPPORT_AUXILIARY_ATTR_CAST_HPP
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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/common_terminals.hpp>
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#include <boost/spirit/home/support/attributes.hpp>
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#include <boost/core/enable_if.hpp>
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#include <boost/proto/traits.hpp>
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// This one is the function that the user can call directly in order
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// to create a customized attr_cast component
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template <typename Expr>
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typename enable_if<proto::is_expr<Expr>
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, stateful_tag_type<Expr, tag::attr_cast> >::type
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attr_cast(Expr const& expr)
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{
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return stateful_tag_type<Expr, tag::attr_cast>(expr);
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}
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template <typename Exposed, typename Expr>
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typename enable_if<proto::is_expr<Expr>
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, stateful_tag_type<Expr, tag::attr_cast, Exposed> >::type
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attr_cast(Expr const& expr)
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{
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return stateful_tag_type<Expr, tag::attr_cast, Exposed>(expr);
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}
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template <typename Exposed, typename Transformed, typename Expr>
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typename enable_if<proto::is_expr<Expr>
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, stateful_tag_type<Expr, tag::attr_cast, Exposed, Transformed> >::type
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attr_cast(Expr const& expr)
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{
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return stateful_tag_type<Expr, tag::attr_cast, Exposed, Transformed>(expr);
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}
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}}
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#endif
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