44 lines
919 B
C++
44 lines
919 B
C++
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#ifndef BOOST_METAPARSE_V1_IS_ERROR_HPP
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#define BOOST_METAPARSE_V1_IS_ERROR_HPP
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// Copyright Abel Sinkovics (abel@sinkovics.hu) 2011.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/metaparse/v1/fail_tag.hpp>
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#include <boost/mpl/tag.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/type_traits/is_same.hpp>
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namespace boost
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{
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namespace metaparse
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{
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namespace v1
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{
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template <class T = boost::mpl::na>
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struct is_error :
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boost::is_same<
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fail_tag,
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typename boost::mpl::tag<typename T::type>::type
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>
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{};
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template <>
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struct is_error<boost::mpl::na>
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{
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typedef is_error type;
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template <class T = boost::mpl::na>
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struct apply : is_error<T> {};
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};
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}
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}
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}
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#endif
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