projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | //----------------------------------------------------------------------------- |
| 2 | // boost variant/detail/make_variant_list.hpp header file | |
| 3 | // See http://www.boost.org for updates, documentation, and revision history. | |
| 4 | //----------------------------------------------------------------------------- | |
| 5 | // | |
| 6 | // Copyright (c) 2002-2003 Eric Friedman, Itay Maman | |
| 7 | // Copyright (c) 2013 Antony Polukhin | |
| 8 | // | |
| 9 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 10 | // accompanying file LICENSE_1_0.txt or copy at | |
| 11 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 12 | ||
| 13 | #ifndef BOOST_VARIANT_DETAIL_MAKE_VARIANT_LIST_HPP | |
| 14 | #define BOOST_VARIANT_DETAIL_MAKE_VARIANT_LIST_HPP | |
| 15 | ||
| 16 | #include <boost/variant/variant_fwd.hpp> | |
| 17 | ||
| 18 | #include <boost/mpl/list.hpp> | |
| 19 | #include <boost/preprocessor/cat.hpp> | |
| 20 | #include <boost/preprocessor/enum.hpp> | |
| 21 | ||
| 22 | namespace boost { | |
| 23 | namespace detail { namespace variant { | |
| 24 | ||
| 25 | /////////////////////////////////////////////////////////////////////////////// | |
| 26 | // (detail) metafunction make_variant_list | |
| 27 | // | |
| 28 | // Provides a MPL-compatible sequence with the specified non-void types | |
| 29 | // as arguments. | |
| 30 | // | |
| 31 | // Rationale: see class template convert_void (variant_fwd.hpp) and using- | |
| 32 | // declaration workaround (below). | |
| 33 | // | |
| 34 | ||
| 35 | #if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES) | |
| 36 | ||
| 37 | template < typename... T > | |
| 38 | struct make_variant_list | |
| 39 | { | |
| 40 | typedef typename mpl::list< T... >::type type; | |
| 41 | }; | |
| 42 | ||
| 43 | #else // defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES) | |
| 44 | ||
| 45 | template < BOOST_VARIANT_ENUM_PARAMS(typename T) > | |
| 46 | struct make_variant_list | |
| 47 | { | |
| 48 | public: // metafunction result | |
| 49 | ||
| 50 | // [Define a macro to convert any void(NN) tags to mpl::void...] | |
| 51 | # define BOOST_VARIANT_AUX_CONVERT_VOID(z, N,_) \ | |
| 52 | typename convert_void< BOOST_PP_CAT(T,N) >::type | |
| 53 | ||
| 54 | // [...so that the specified types can be passed to mpl::list...] | |
| 55 | typedef typename mpl::list< | |
| 56 | BOOST_PP_ENUM( | |
| 57 | BOOST_VARIANT_LIMIT_TYPES | |
| 58 | , BOOST_VARIANT_AUX_CONVERT_VOID | |
| 59 | , _ | |
| 60 | ) | |
| 61 | >::type type; | |
| 62 | ||
| 63 | // [...and, finally, the conversion macro can be undefined:] | |
| 64 | # undef BOOST_VARIANT_AUX_CONVERT_VOID | |
| 65 | ||
| 66 | }; | |
| 67 | ||
| 68 | #endif // BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES workaround | |
| 69 | ||
| 70 | }} // namespace detail::variant | |
| 71 | } // namespace boost | |
| 72 | ||
| 73 | #endif // BOOST_VARIANT_DETAIL_MAKE_VARIANT_LIST_HPP |