99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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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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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_WRAP_UNWRAP_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_WRAP_UNWRAP_HPP_INCLUDED
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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/config.hpp> // SFINAE, MSVC.
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#include <boost/detail/workaround.hpp>
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#include <boost/iostreams/detail/enable_if_stream.hpp>
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#include <boost/iostreams/traits_fwd.hpp> // is_std_io.
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/ref.hpp>
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namespace boost { namespace iostreams { namespace detail {
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//------------------Definition of wrap/unwrap traits--------------------------//
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template<typename T>
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struct wrapped_type
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: mpl::if_<is_std_io<T>, reference_wrapper<T>, T>
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{ };
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template<typename T>
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struct unwrapped_type
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: unwrap_reference<T>
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{ };
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template<typename T>
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struct unwrap_ios
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: mpl::eval_if<
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is_std_io<T>,
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unwrap_reference<T>,
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mpl::identity<T>
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>
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{ };
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//------------------Definition of wrap----------------------------------------//
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#ifndef BOOST_NO_SFINAE //----------------------------------------------------//
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template<typename T>
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inline T wrap(const T& t BOOST_IOSTREAMS_DISABLE_IF_STREAM(T))
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{ return t; }
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template<typename T>
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inline typename wrapped_type<T>::type
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wrap(T& t BOOST_IOSTREAMS_ENABLE_IF_STREAM(T)) { return boost::ref(t); }
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#else // #ifndef BOOST_NO_SFINAE //-------------------------------------------//
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template<typename T>
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inline typename wrapped_type<T>::type // BCC 5.x needs namespace qualification.
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wrap_impl(const T& t, mpl::true_) { return boost::ref(const_cast<T&>(t)); }
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template<typename T>
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inline typename wrapped_type<T>::type // BCC 5.x needs namespace qualification.
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wrap_impl(T& t, mpl::true_) { return boost::ref(t); }
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template<typename T>
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inline typename wrapped_type<T>::type
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wrap_impl(const T& t, mpl::false_) { return t; }
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template<typename T>
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inline typename wrapped_type<T>::type
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wrap_impl(T& t, mpl::false_) { return t; }
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template<typename T>
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inline typename wrapped_type<T>::type
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wrap(const T& t) { return wrap_impl(t, is_std_io<T>()); }
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template<typename T>
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inline typename wrapped_type<T>::type
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wrap(T& t) { return wrap_impl(t, is_std_io<T>()); }
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#endif // #ifndef BOOST_NO_SFINAE //------------------------------------------//
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//------------------Definition of unwrap--------------------------------------//
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template<typename T>
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typename unwrapped_type<T>::type&
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unwrap(const reference_wrapper<T>& ref) { return ref.get(); }
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template<typename T>
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typename unwrapped_type<T>::type& unwrap(T& t) { return t; }
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template<typename T>
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const typename unwrapped_type<T>::type& unwrap(const T& t) { return t; }
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} } } // End namespaces detail, iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_WRAP_UNWRAP_HPP_INCLUDED
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