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Add boost::variant
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252
boost/variant/detail/substitute.hpp
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252
boost/variant/detail/substitute.hpp
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#if !defined(BOOST_PP_IS_ITERATING)
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///// header body
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//-----------------------------------------------------------------------------
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// boost variant/detail/substitute.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_SUBSTITUTE_HPP
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#define BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
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#include "boost/mpl/aux_/config/ctps.hpp"
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#include "boost/variant/detail/substitute_fwd.hpp"
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#include "boost/mpl/aux_/lambda_arity_param.hpp"
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#include "boost/mpl/aux_/preprocessor/params.hpp"
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#include "boost/mpl/aux_/preprocessor/repeat.hpp"
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#include "boost/mpl/int_fwd.hpp"
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#include "boost/mpl/limits/arity.hpp"
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#include "boost/preprocessor/cat.hpp"
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#include "boost/preprocessor/empty.hpp"
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#include "boost/preprocessor/arithmetic/inc.hpp"
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#include "boost/preprocessor/iterate.hpp"
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namespace boost {
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namespace detail { namespace variant {
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#if !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
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///////////////////////////////////////////////////////////////////////////////
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// (detail) metafunction substitute
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//
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// Substitutes one type for another in the given type expression.
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//
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//
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// primary template
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//
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template <
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typename T, typename Dest, typename Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(
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typename Arity /* = ... (see substitute_fwd.hpp) */
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)
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>
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struct substitute
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{
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typedef T type;
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};
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//
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// tag substitution specializations
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//
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#define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(CV_) \
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template <typename Dest, typename Source> \
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struct substitute< \
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CV_ Source \
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, Dest \
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, Source \
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>) \
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> \
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{ \
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typedef CV_ Dest type; \
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}; \
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/**/
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG( BOOST_PP_EMPTY() )
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(const)
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(volatile)
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG(const volatile)
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#undef BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_SUBSTITUTE_TAG
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//
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// pointer specializations
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//
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#define BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(CV_) \
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template <typename T, typename Dest, typename Source> \
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struct substitute< \
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T * CV_ \
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, Dest \
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, Source \
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>) \
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> \
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{ \
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typedef typename substitute< \
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T, Dest, Source \
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>::type * CV_ type; \
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}; \
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/**/
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER( BOOST_PP_EMPTY() )
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(const)
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(volatile)
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BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER(const volatile)
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#undef BOOST_VARIANT_AUX_ENABLE_RECURSIVE_IMPL_HANDLE_POINTER
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//
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// reference specializations
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//
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template <typename T, typename Dest, typename Source>
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struct substitute<
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T&
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, Dest
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, Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
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>
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{
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typedef typename substitute<
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T, Dest, Source
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>::type & type;
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};
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//
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// template expression (i.e., F<...>) specializations
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//
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#if !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
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template <
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template <typename...> class F
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, typename... Ts
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, typename Dest
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, typename Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(typename Arity)
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>
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struct substitute<
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F<Ts...>
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, Dest
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, Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(Arity)
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>
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{
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typedef F<typename substitute<
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Ts, Dest, Source
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>::type...> type;
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};
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#endif // !defined(BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES)
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#define BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL(N) \
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typedef typename substitute< \
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BOOST_PP_CAT(U,N), Dest, Source \
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>::type BOOST_PP_CAT(u,N); \
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/**/
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#define BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF(z, N, _) \
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BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL( BOOST_PP_INC(N) ) \
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/**/
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#define BOOST_PP_ITERATION_LIMITS (0,BOOST_MPL_LIMIT_METAFUNCTION_ARITY)
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#define BOOST_PP_FILENAME_1 "boost/variant/detail/substitute.hpp"
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#include BOOST_PP_ITERATE()
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#undef BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF_IMPL
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#undef BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF
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#endif // !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
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}} // namespace detail::variant
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} // namespace boost
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#endif // BOOST_VARIANT_DETAIL_SUBSTITUTE_HPP
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///// iteration, depth == 1
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#elif BOOST_PP_ITERATION_DEPTH() == 1
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#define i BOOST_PP_FRAME_ITERATION(1)
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#if i > 0
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//
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// template specializations
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//
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template <
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template < BOOST_MPL_PP_PARAMS(i,typename P) > class T
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, BOOST_MPL_PP_PARAMS(i,typename U)
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, typename Dest
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, typename Source
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>
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struct substitute<
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T< BOOST_MPL_PP_PARAMS(i,U) >
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, Dest
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, Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<( i )>)
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>
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{
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private:
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BOOST_MPL_PP_REPEAT(i, BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF, _)
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public:
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typedef T< BOOST_MPL_PP_PARAMS(i,u) > type;
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};
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//
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// function specializations
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//
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template <
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typename R
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, BOOST_MPL_PP_PARAMS(i,typename U)
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, typename Dest
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, typename Source
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>
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struct substitute<
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R (*)( BOOST_MPL_PP_PARAMS(i,U) )
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, Dest
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, Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
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>
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{
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private:
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typedef typename substitute< R, Dest, Source >::type r;
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BOOST_MPL_PP_REPEAT(i, BOOST_VARIANT_AUX_SUBSTITUTE_TYPEDEF, _)
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public:
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typedef r (*type)( BOOST_MPL_PP_PARAMS(i,u) );
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};
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#elif i == 0
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//
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// zero-arg function specialization
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//
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template <
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typename R, typename Dest, typename Source
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>
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struct substitute<
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R (*)( void )
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, Dest
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, Source
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BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(mpl::int_<-1>)
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>
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{
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private:
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typedef typename substitute< R, Dest, Source >::type r;
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public:
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typedef r (*type)( void );
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};
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#endif // i
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#undef i
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#endif // BOOST_PP_IS_ITERATING
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