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98 lines
3.1 KiB
98 lines
3.1 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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/// \file pack.hpp
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/// Contains helpers for pseudo-pack expansion.
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//
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// Copyright 2012 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROTO_TRANSFORM_DETAIL_PACK_HPP_EAN_2012_07_11
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#define BOOST_PROTO_TRANSFORM_DETAIL_PACK_HPP_EAN_2012_07_11
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/arithmetic/dec.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/punctuation/comma_if.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#include <boost/preprocessor/iteration/local.hpp>
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#include <boost/preprocessor/iteration/iterate.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/proto/proto_fwd.hpp>
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#if defined(_MSC_VER)
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# pragma warning(push)
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# pragma warning(disable: 4348) // redefinition of default parameter
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#endif
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namespace boost { namespace proto
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{
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namespace detail
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{
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template<typename Fun>
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struct msvc_fun_workaround;
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template<typename Tfx, typename T>
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struct expand_pattern_helper
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{
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typedef T type;
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typedef mpl::false_ applied;
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};
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template<typename Tfx, typename Fun>
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struct expand_pattern_helper<Tfx, Fun *>
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: expand_pattern_helper<Tfx, Fun>
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{};
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template<typename Tfx, typename T>
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struct expand_pattern_helper<Tfx, pack(T)>
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{
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// BUGBUG fix me. See comment in transform/detail/call.hpp
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BOOST_MPL_ASSERT_MSG(
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(is_same<T, _>::value)
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, PACK_EXPANSIONS_OF_EXPRESSIONS_OTHER_THAN_THE_CURRENT_NOT_YET_SUPPORTED
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, (T)
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);
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typedef Tfx type(T);
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typedef mpl::true_ applied;
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};
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template<typename Tfx>
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struct expand_pattern_helper<Tfx, pack(_)>
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{
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typedef Tfx type;
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typedef mpl::true_ applied;
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};
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#include <boost/proto/transform/detail/expand_pack.hpp>
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template<long Arity, typename Fun, typename Cont>
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struct expand_pattern;
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template<typename Fun, typename Cont>
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struct expand_pattern<0, Fun, Cont>
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: Cont::template cat<typename expand_pattern_helper<proto::_value, Fun>::type>
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{
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BOOST_MPL_ASSERT_MSG(
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(expand_pattern_helper<proto::_value, Fun>::applied::value)
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, NO_PACK_EXPRESSION_FOUND_IN_PACK_EXPANSION
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, (Fun)
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);
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};
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#include <boost/proto/transform/detail/pack_impl.hpp>
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}
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}}
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#if defined(_MSC_VER)
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# pragma warning(pop)
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#endif
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#endif
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