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64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
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//-----------------------------------------------------------------------------
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// boost variant/detail/element_index.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2014-2015 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// 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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#ifndef BOOST_VARIANT_DETAIL_ELEMENT_INDEX_HPP
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#define BOOST_VARIANT_DETAIL_ELEMENT_INDEX_HPP
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#include <boost/config.hpp>
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#include <boost/variant/recursive_wrapper_fwd.hpp>
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/mpl/find_if.hpp>
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namespace boost { namespace detail { namespace variant {
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template <class VariantElement, class T>
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struct variant_element_functor :
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boost::mpl::or_<
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boost::is_same<VariantElement, T>,
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boost::is_same<VariantElement, boost::recursive_wrapper<T> >,
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boost::is_same<VariantElement, T& >
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>
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{};
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template <class Types, class T>
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struct element_iterator_impl :
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boost::mpl::find_if<
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Types,
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boost::mpl::or_<
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variant_element_functor<boost::mpl::_1, T>,
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variant_element_functor<boost::mpl::_1, typename boost::remove_cv<T>::type >
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>
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>
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{};
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template <class Variant, class T>
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struct element_iterator :
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element_iterator_impl< typename Variant::types, typename boost::remove_reference<T>::type >
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{};
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template <class Variant, class T>
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struct holds_element :
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boost::mpl::not_<
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boost::is_same<
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typename boost::mpl::end<typename Variant::types>::type,
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typename element_iterator<Variant, T>::type
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>
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>
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{};
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}}} // namespace boost::detail::variant
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#endif // BOOST_VARIANT_DETAIL_ELEMENT_INDEX_HPP
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