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#ifndef BOOST_CONTRACT_DETAIL_OPTIONAL_HPP_
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#define BOOST_CONTRACT_DETAIL_OPTIONAL_HPP_
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// Copyright (C) 2008-2018 Lorenzo Caminiti
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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 a copy at http://www.boost.org/LICENSE_1_0.txt).
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// See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
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#include <boost/optional.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/type_traits/integral_constant.hpp>
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namespace boost { namespace contract { namespace detail {
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template<typename T>
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struct is_optional : boost::false_type {};
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template<typename T>
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struct is_optional<boost::optional<T> > : boost::true_type {};
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template<typename T>
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struct optional_value_type { typedef T type; };
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template<typename T>
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struct optional_value_type<boost::optional<T> > { typedef T type; };
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template<typename T>
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struct remove_value_reference_if_optional { typedef T type; };
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template<typename T>
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struct remove_value_reference_if_optional<boost::optional<T> >
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{ typedef typename boost::remove_reference<T>::type type; };
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template<typename T>
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T& optional_get(T& x) { return x; }
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template<typename T>
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T& optional_get(boost::optional<T>& x) { return x.get(); }
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template<typename T>
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T& optional_get(boost::optional<T&>& x) { return x.get(); }
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} } } // namespace
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#endif // #include guard
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