80f97ea03b
* Add back variant. Turns out dynarmic needs this * Explicitely add circular_buffer. We rely on this but it was removed previously * Trim down url and iostreams libraries to what we need
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
//-----------------------------------------------------------------------------
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// boost variant/detail/enable_recursive_fwd.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) 2003
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// Eric Friedman
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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_ENABLE_RECURSIVE_FWD_HPP
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#define BOOST_VARIANT_DETAIL_ENABLE_RECURSIVE_FWD_HPP
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#include <boost/mpl/aux_/config/ctps.hpp>
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#include <boost/mpl/bool_fwd.hpp>
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# include <boost/mpl/bool.hpp>
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namespace boost {
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namespace detail { namespace variant {
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///////////////////////////////////////////////////////////////////////////////
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// (detail) tag recursive_flag
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//
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// Signifies that the variant should perform recursive substituion.
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//
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template <typename T>
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struct recursive_flag
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{
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typedef T type;
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};
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///////////////////////////////////////////////////////////////////////////////
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// (detail) metafunction is_recursive_flag
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//
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// Signifies that the variant should perform recursive substituion.
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//
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template <typename T>
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struct is_recursive_flag
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: mpl::false_
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{
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};
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template <typename T>
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struct is_recursive_flag< recursive_flag<T> >
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: mpl::true_
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{
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};
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///////////////////////////////////////////////////////////////////////////////
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// (detail) metafunction enable_recursive
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//
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// Attempts recursive_variant_ tag substitution, wrapping with
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// boost::recursive_wrapper if substituion occurs w/ non-indirect result
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// (i.e., not a reference or pointer) *and* NoWrapper is false_.
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//
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template <
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typename T
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, typename RecursiveVariant
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, typename NoWrapper = mpl::false_
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>
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struct enable_recursive;
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///////////////////////////////////////////////////////////////////////////////
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// (detail) metafunction class quoted_enable_recursive
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//
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// Same behavior as enable_recursive metafunction (see above).
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//
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template <
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typename RecursiveVariant
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, typename NoWrapper = mpl::false_
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>
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struct quoted_enable_recursive;
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}} // namespace detail::variant
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} // namespace boost
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#endif // BOOST_VARIANT_DETAIL_ENABLE_RECURSIVE_FWD_HPP
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