201 lines
6.9 KiB
Plaintext
201 lines
6.9 KiB
Plaintext
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///////////////////////////////////////////////////////////////////////////////
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/// \file deduce_domain.hpp
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/// Contains definition of deduce_domain\<\> class templates
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/// for finding the domain that is common among the specified
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/// domains
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//
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// Copyright 2010 Daniel Wallin, 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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//
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// Many thanks to Daniel Wallin who first implemented this code. Thanks
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// also to Jeremiah Willcock, John Bytheway and Krishna Achuthan who
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// offered alternate solutions to this tricky programming problem.
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#ifndef BOOST_PROTO_DEDUCE_DOMAIN_HPP_EAN_05_22_2010
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#define BOOST_PROTO_DEDUCE_DOMAIN_HPP_EAN_05_22_2010
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#include <boost/config.hpp>
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#include <boost/preprocessor/cat.hpp>
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#include <boost/preprocessor/facilities/intercept.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/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/preprocessor/arithmetic/inc.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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#ifndef BOOST_PROTO_ASSERT_VALID_DOMAIN
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# define BOOST_PROTO_ASSERT_VALID_DOMAIN(DOM) BOOST_MPL_ASSERT_NOT((boost::is_same<DOM, boost::proto::detail::not_a_domain>))
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#endif
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namespace boost
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{
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namespace proto
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{
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namespace detail
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{
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template<typename Domain>
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struct domain_
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: domain_<typename Domain::proto_super_domain>
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{
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typedef Domain type;
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typedef domain_<typename Domain::proto_super_domain> base;
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#ifdef BOOST_NO_CXX11_DECLTYPE
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using base::deduce98;
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static int const index = base::index + 1;
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static typename sized_type<index>::type deduce98(domain_<Domain>*);
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#else
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using base::deduce0x;
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static Domain deduce0x(domain_<Domain>*);
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#endif
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};
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template<>
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struct domain_<not_a_domain>
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{
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typedef not_a_domain type;
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#ifdef BOOST_NO_CXX11_DECLTYPE
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static int const index = 1;
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static sized_type<1>::type deduce98(void*);
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#else
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static not_a_domain deduce0x(void*);
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#endif
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};
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template<>
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struct domain_<default_domain>
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: domain_<not_a_domain>
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{};
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template<>
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struct domain_<basic_default_domain>
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: domain_<not_a_domain>
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{};
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sized_type<1>::type default_test(void*, void*);
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sized_type<2>::type default_test(domain_<default_domain>*, void*);
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sized_type<2>::type default_test(domain_<basic_default_domain>*, void*);
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sized_type<3>::type default_test(void*, domain_<default_domain>*);
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sized_type<3>::type default_test(void*, domain_<basic_default_domain>*);
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sized_type<4>::type default_test(domain_<default_domain>*, domain_<default_domain>*);
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sized_type<4>::type default_test(domain_<basic_default_domain>*, domain_<default_domain>*);
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sized_type<4>::type default_test(domain_<default_domain>*, domain_<basic_default_domain>*);
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sized_type<4>::type default_test(domain_<basic_default_domain>*, domain_<basic_default_domain>*);
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#ifdef BOOST_NO_CXX11_DECLTYPE
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template<int N, typename Domain>
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struct nth_domain
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: nth_domain<N - 1, typename Domain::base>
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{};
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template<typename Domain>
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struct nth_domain<0, Domain>
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: Domain
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{};
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#endif
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template<typename D0>
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struct common_domain1
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{
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typedef D0 type;
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};
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template<typename E0>
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struct deduce_domain1
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: domain_of<E0>
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{};
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template<
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typename D0
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, typename D1
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, int DefaultCase = sizeof(proto::detail::default_test((domain_<D0>*)0, (domain_<D1>*)0))
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>
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struct common_domain2
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{
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#ifdef BOOST_NO_CXX11_DECLTYPE
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static int const index = domain_<D0>::index - sizeof(domain_<D0>::deduce98((domain_<D1>*)0));
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typedef typename nth_domain<index, domain_<D0> >::type type;
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#else
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typedef decltype(domain_<D0>::deduce0x((domain_<D1>*)0)) type;
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#endif
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};
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template<typename D0, typename D1>
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struct common_domain2<D0, D1, 2>
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{
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typedef D1 type;
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};
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template<typename D0, typename D1>
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struct common_domain2<D0, D1, 3>
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{
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typedef D0 type;
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};
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template<typename D0>
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struct common_domain2<D0, default_domain, 4>
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{
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typedef D0 type;
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};
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template<typename D0>
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struct common_domain2<D0, basic_default_domain, 4>
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{
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typedef D0 type;
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};
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template<typename D1>
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struct common_domain2<default_domain, D1, 4>
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{
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typedef D1 type;
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};
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template<typename D1>
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struct common_domain2<basic_default_domain, D1, 4>
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{
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typedef D1 type;
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};
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template<>
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struct common_domain2<default_domain, default_domain, 4>
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{
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typedef default_domain type;
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};
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template<>
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struct common_domain2<basic_default_domain, default_domain, 4>
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{
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typedef default_domain type;
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};
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template<>
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struct common_domain2<default_domain, basic_default_domain, 4>
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{
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typedef default_domain type;
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};
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template<>
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struct common_domain2<basic_default_domain, basic_default_domain, 4>
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{
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typedef basic_default_domain type;
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};
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template<typename E0, typename E1>
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struct deduce_domain2
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: common_domain2<
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typename domain_of<E0>::type
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, typename domain_of<E1>::type
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>
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{};
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#include <boost/proto/detail/deduce_domain_n.hpp>
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}
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}
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}
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#endif // BOOST_PROTO_DEDUCE_DOMAIN_HPP_EAN_05_22_2010
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