74 lines
2.3 KiB
Plaintext
74 lines
2.3 KiB
Plaintext
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//-----------------------------------------------------------------------------
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// boost variant/detail/make_variant_list.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) 2002-2003 Eric Friedman, Itay Maman
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// Copyright (c) 2013 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_MAKE_VARIANT_LIST_HPP
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#define BOOST_VARIANT_DETAIL_MAKE_VARIANT_LIST_HPP
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/mpl/list.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/enum.hpp>
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namespace boost {
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namespace detail { namespace variant {
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///////////////////////////////////////////////////////////////////////////////
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// (detail) metafunction make_variant_list
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//
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// Provides a MPL-compatible sequence with the specified non-void types
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// as arguments.
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//
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// Rationale: see class template convert_void (variant_fwd.hpp) and using-
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// declaration workaround (below).
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//
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#if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
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template < typename... T >
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struct make_variant_list
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{
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typedef typename mpl::list< T... >::type type;
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};
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#else // defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
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template < BOOST_VARIANT_ENUM_PARAMS(typename T) >
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struct make_variant_list
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{
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public: // metafunction result
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// [Define a macro to convert any void(NN) tags to mpl::void...]
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# define BOOST_VARIANT_AUX_CONVERT_VOID(z, N,_) \
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typename convert_void< BOOST_PP_CAT(T,N) >::type
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// [...so that the specified types can be passed to mpl::list...]
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typedef typename mpl::list<
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BOOST_PP_ENUM(
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BOOST_VARIANT_LIMIT_TYPES
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, BOOST_VARIANT_AUX_CONVERT_VOID
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, _
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)
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>::type type;
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// [...and, finally, the conversion macro can be undefined:]
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# undef BOOST_VARIANT_AUX_CONVERT_VOID
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};
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#endif // BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES workaround
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}} // namespace detail::variant
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} // namespace boost
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#endif // BOOST_VARIANT_DETAIL_MAKE_VARIANT_LIST_HPP
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