projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
| 2 | // (C) Copyright 2003-2007 Jonathan Turkanis | |
| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) | |
| 5 | ||
| 6 | // See http://www.boost.org/libs/iostreams for documentation. | |
| 7 | ||
| 8 | #ifndef BOOST_IOSTREAMS_DETAIL_WRAP_UNWRAP_HPP_INCLUDED | |
| 9 | #define BOOST_IOSTREAMS_DETAIL_WRAP_UNWRAP_HPP_INCLUDED | |
| 10 | ||
| 11 | #if defined(_MSC_VER) | |
| 12 | # pragma once | |
| 13 | #endif | |
| 14 | ||
| 15 | #include <boost/config.hpp> // SFINAE, MSVC. | |
| 16 | #include <boost/detail/workaround.hpp> | |
| 17 | #include <boost/iostreams/detail/enable_if_stream.hpp> | |
| 18 | #include <boost/iostreams/traits_fwd.hpp> // is_std_io. | |
| 19 | #include <boost/mpl/bool.hpp> | |
| 20 | #include <boost/mpl/identity.hpp> | |
| 21 | #include <boost/mpl/eval_if.hpp> | |
| 22 | #include <boost/mpl/if.hpp> | |
| 23 | #include <boost/ref.hpp> | |
| 24 | ||
| 25 | namespace boost { namespace iostreams { namespace detail { | |
| 26 | ||
| 27 | //------------------Definition of wrap/unwrap traits--------------------------// | |
| 28 | ||
| 29 | template<typename T> | |
| 30 | struct wrapped_type | |
| 31 | : mpl::if_<is_std_io<T>, reference_wrapper<T>, T> | |
| 32 | { }; | |
| 33 | ||
| 34 | template<typename T> | |
| 35 | struct unwrapped_type | |
| 36 | : unwrap_reference<T> | |
| 37 | { }; | |
| 38 | ||
| 39 | template<typename T> | |
| 40 | struct unwrap_ios | |
| 41 | : mpl::eval_if< | |
| 42 | is_std_io<T>, | |
| 43 | unwrap_reference<T>, | |
| 44 | mpl::identity<T> | |
| 45 | > | |
| 46 | { }; | |
| 47 | ||
| 48 | //------------------Definition of wrap----------------------------------------// | |
| 49 | ||
| 50 | #ifndef BOOST_NO_SFINAE //----------------------------------------------------// | |
| 51 | template<typename T> | |
| 52 | inline T wrap(const T& t BOOST_IOSTREAMS_DISABLE_IF_STREAM(T)) | |
| 53 | { return t; } | |
| 54 | ||
| 55 | template<typename T> | |
| 56 | inline typename wrapped_type<T>::type | |
| 57 | wrap(T& t BOOST_IOSTREAMS_ENABLE_IF_STREAM(T)) { return boost::ref(t); } | |
| 58 | #else // #ifndef BOOST_NO_SFINAE //-------------------------------------------// | |
| 59 | template<typename T> | |
| 60 | inline typename wrapped_type<T>::type // BCC 5.x needs namespace qualification. | |
| 61 | wrap_impl(const T& t, mpl::true_) { return boost::ref(const_cast<T&>(t)); } | |
| 62 | ||
| 63 | template<typename T> | |
| 64 | inline typename wrapped_type<T>::type // BCC 5.x needs namespace qualification. | |
| 65 | wrap_impl(T& t, mpl::true_) { return boost::ref(t); } | |
| 66 | ||
| 67 | template<typename T> | |
| 68 | inline typename wrapped_type<T>::type | |
| 69 | wrap_impl(const T& t, mpl::false_) { return t; } | |
| 70 | ||
| 71 | template<typename T> | |
| 72 | inline typename wrapped_type<T>::type | |
| 73 | wrap_impl(T& t, mpl::false_) { return t; } | |
| 74 | ||
| 75 | template<typename T> | |
| 76 | inline typename wrapped_type<T>::type | |
| 77 | wrap(const T& t) { return wrap_impl(t, is_std_io<T>()); } | |
| 78 | ||
| 79 | template<typename T> | |
| 80 | inline typename wrapped_type<T>::type | |
| 81 | wrap(T& t) { return wrap_impl(t, is_std_io<T>()); } | |
| 82 | #endif // #ifndef BOOST_NO_SFINAE //------------------------------------------// | |
| 83 | ||
| 84 | //------------------Definition of unwrap--------------------------------------// | |
| 85 | ||
| 86 | template<typename T> | |
| 87 | typename unwrapped_type<T>::type& | |
| 88 | unwrap(const reference_wrapper<T>& ref) { return ref.get(); } | |
| 89 | ||
| 90 | template<typename T> | |
| 91 | typename unwrapped_type<T>::type& unwrap(T& t) { return t; } | |
| 92 | ||
| 93 | template<typename T> | |
| 94 | const typename unwrapped_type<T>::type& unwrap(const T& t) { return t; } | |
| 95 | ||
| 96 | } } } // End namespaces detail, iostreams, boost. | |
| 97 | ||
| 98 | #endif // #ifndef BOOST_IOSTREAMS_DETAIL_WRAP_UNWRAP_HPP_INCLUDED |