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// Boost.TypeErasure library
//
// Copyright 2011 Steven Watanabe
//
// Distributed under the Boost Software License Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// $Id$
#if !defined(BOOST_PP_IS_ITERATING)
#ifndef BOOST_TYPE_ERASURE_DETAIL_ADAPT_TO_VTABLE_HPP_INCLUDED
#define BOOST_TYPE_ERASURE_DETAIL_ADAPT_TO_VTABLE_HPP_INCLUDED
#include <boost/utility/addressof.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/has_xxx.hpp>
#include <boost/type_traits/function_traits.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/type_erasure/detail/get_signature.hpp>
#include <boost/type_erasure/detail/storage.hpp>
#include <boost/type_erasure/is_placeholder.hpp>
#include <boost/type_erasure/config.hpp>
namespace boost {
namespace type_erasure {
namespace detail {
template<class T, class Bindings>
struct rebind_placeholders;
template<class T, class Bindings>
struct rebind_placeholders_in_argument;
template<class PrimitiveConcept, class Sig>
struct vtable_adapter;
template<class PrimitiveConcept, class Sig, class Bindings>
struct rebind_placeholders<vtable_adapter<PrimitiveConcept, Sig>, Bindings>
{
typedef vtable_adapter<
typename rebind_placeholders<PrimitiveConcept, Bindings>::type,
typename rebind_placeholders_in_argument<Sig, Bindings>::type
> type;
};
template<class T>
struct replace_param_for_vtable
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
const ::boost::type_erasure::detail::storage&,
T
>::type type;
};
template<class T>
struct replace_param_for_vtable<T&>
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
::boost::type_erasure::detail::storage&,
T&
>::type type;
};
template<class T>
struct replace_param_for_vtable<const T&>
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
const ::boost::type_erasure::detail::storage&,
const T&
>::type type;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class T>
struct replace_param_for_vtable<T&&>
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
::boost::type_erasure::detail::storage&&,
T&&
>::type type;
};
#endif
template<class T>
struct replace_result_for_vtable
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
::boost::type_erasure::detail::storage,
T
>::type type;
};
template<class T>
struct replace_result_for_vtable<T&>
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
::boost::type_erasure::detail::storage&,
T&
>::type type;
};
template<class T>
struct replace_result_for_vtable<const T&>
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
::boost::type_erasure::detail::storage&,
const T&
>::type type;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class T>
struct replace_result_for_vtable<T&&>
{
typedef typename ::boost::mpl::if_<
::boost::type_erasure::is_placeholder<typename ::boost::remove_cv<T>::type>,
::boost::type_erasure::detail::storage&&,
T&&
>::type type;
};
#endif
template<class Sig>
struct get_vtable_signature;
BOOST_MPL_HAS_XXX_TRAIT_DEF(type)
template<class T>
struct is_internal_concept :
::boost::type_erasure::detail::has_type<T>
{};
template<class PrimitiveConcept>
struct adapt_to_vtable
{
typedef ::boost::type_erasure::detail::vtable_adapter<
PrimitiveConcept,
typename ::boost::type_erasure::detail::get_vtable_signature<
typename ::boost::type_erasure::detail::get_signature<
PrimitiveConcept
>::type
>::type
> type;
};
template<class Concept>
struct maybe_adapt_to_vtable
{
typedef typename ::boost::mpl::eval_if<
::boost::type_erasure::detail::is_internal_concept<Concept>,
::boost::mpl::identity<Concept>,
::boost::type_erasure::detail::adapt_to_vtable<Concept>
>::type type;
};
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template<class PrimitiveConcept, class Sig, class ConceptSig>
struct vtable_adapter_impl;
template<class PrimitiveConcept, class R, class... T, class R2, class... U>
struct vtable_adapter_impl<PrimitiveConcept, R(T...), R2(U...)>
{
typedef R (*type)(T...);
static R value(T... arg)
{
return PrimitiveConcept::apply(
::boost::type_erasure::detail::extract<U>(std::forward<T>(arg))...);
}
};
template<class PrimitiveConcept, class... T, class R2, class... U>
struct vtable_adapter_impl<PrimitiveConcept, ::boost::type_erasure::detail::storage&(T...), R2(U...)>
{
typedef ::boost::type_erasure::detail::storage (*type)(T...);
static ::boost::type_erasure::detail::storage value(T... arg)
{
::boost::type_erasure::detail::storage result;
typename ::boost::remove_reference<R2>::type* p =
::boost::addressof(
PrimitiveConcept::apply(::boost::type_erasure::detail::extract<U>(std::forward<T>(arg))...));
result.data = const_cast<void*>(static_cast<const void*>(p));
return result;
}
};
template<class PrimitiveConcept, class... T, class R2, class... U>
struct vtable_adapter_impl<PrimitiveConcept, ::boost::type_erasure::detail::storage&&(T...), R2(U...)>
{
typedef ::boost::type_erasure::detail::storage (*type)(T...);
static ::boost::type_erasure::detail::storage value(T... arg)
{
::boost::type_erasure::detail::storage result;
R2 tmp = PrimitiveConcept::apply(::boost::type_erasure::detail::extract<U>(std::forward<T>(arg))...);
typename ::boost::remove_reference<R2>::type* p = ::boost::addressof(tmp);
result.data = const_cast<void*>(static_cast<const void*>(p));
return result;
}
};
template<class PrimitiveConcept, class Sig>
struct vtable_adapter
: vtable_adapter_impl<
PrimitiveConcept,
Sig,
typename ::boost::type_erasure::detail::get_signature<
PrimitiveConcept
>::type
>
{};
template<class R, class... T>
struct get_vtable_signature<R(T...)>
{
typedef typename ::boost::type_erasure::detail::replace_result_for_vtable<
R
>::type type(typename ::boost::type_erasure::detail::replace_param_for_vtable<T>::type...);
};
#else
#define BOOST_PP_FILENAME_1 <boost/type_erasure/detail/adapt_to_vtable.hpp>
#define BOOST_PP_ITERATION_LIMITS (0, BOOST_TYPE_ERASURE_MAX_ARITY)
#include BOOST_PP_ITERATE()
#endif
}
}
}
#endif
#else
#define N BOOST_PP_ITERATION()
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
#define BOOST_TYPE_ERASURE_EXTRACT(z, n, data) \
::boost::type_erasure::detail::extract< \
typename traits:: \
BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(n)), _type) \
>(std::forward<BOOST_PP_CAT(T, n)>(BOOST_PP_CAT(arg, n)))
#else
#define BOOST_TYPE_ERASURE_EXTRACT(z, n, data) \
::boost::type_erasure::detail::extract< \
typename traits:: \
BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(n)), _type) \
>(BOOST_PP_CAT(arg, n))
#endif
#define BOOST_TYPE_ERASURE_REPLACE_PARAM(z, n, data) \
typename ::boost::type_erasure::detail::replace_param_for_vtable< \
BOOST_PP_CAT(T, n)>::type
template<class PrimitiveConcept, class R
BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)>
struct vtable_adapter<PrimitiveConcept, R(BOOST_PP_ENUM_PARAMS(N, T))>
{
typedef R (*type)(BOOST_PP_ENUM_PARAMS(N, T));
static R value(BOOST_PP_ENUM_BINARY_PARAMS(N, T, arg))
{
typedef typename ::boost::function_traits<
typename ::boost::type_erasure::detail::get_signature<
PrimitiveConcept
>::type
> traits;
return PrimitiveConcept::apply(
BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_EXTRACT, ~));
}
};
template<class PrimitiveConcept
BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)>
struct vtable_adapter<PrimitiveConcept, ::boost::type_erasure::detail::storage&(BOOST_PP_ENUM_PARAMS(N, T))>
{
typedef ::boost::type_erasure::detail::storage (*type)(BOOST_PP_ENUM_PARAMS(N, T));
static ::boost::type_erasure::detail::storage value(BOOST_PP_ENUM_BINARY_PARAMS(N, T, arg))
{
typedef typename ::boost::function_traits<
typename ::boost::type_erasure::detail::get_signature<
PrimitiveConcept
>::type
> traits;
::boost::type_erasure::detail::storage result;
typename ::boost::remove_reference<typename traits::result_type>::type* p =
::boost::addressof(
PrimitiveConcept::apply(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_EXTRACT, ~)));
result.data = const_cast<void*>(static_cast<const void*>(p));
return result;
}
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class PrimitiveConcept
BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)>
struct vtable_adapter<PrimitiveConcept, ::boost::type_erasure::detail::storage&&(BOOST_PP_ENUM_PARAMS(N, T))>
{
typedef ::boost::type_erasure::detail::storage (*type)(BOOST_PP_ENUM_PARAMS(N, T));
static ::boost::type_erasure::detail::storage value(BOOST_PP_ENUM_BINARY_PARAMS(N, T, arg))
{
typedef typename ::boost::function_traits<
typename ::boost::type_erasure::detail::get_signature<
PrimitiveConcept
>::type
> traits;
::boost::type_erasure::detail::storage result;
typename traits::result_type tmp =
PrimitiveConcept::apply(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_EXTRACT, ~));
typename ::boost::remove_reference<typename traits::result_type>::type* p =
::boost::addressof(tmp);
result.data = const_cast<void*>(static_cast<const void*>(p));
return result;
}
};
#endif
template<class R BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)>
struct get_vtable_signature<R(BOOST_PP_ENUM_PARAMS(N, T))>
{
typedef typename ::boost::type_erasure::detail::replace_result_for_vtable<
R
>::type type(BOOST_PP_ENUM(N, BOOST_TYPE_ERASURE_REPLACE_PARAM, ~));
};
#undef BOOST_TYPE_ERASURE_REPLACE_PARAM
#undef BOOST_TYPE_ERASURE_EXTRACT
#undef N
#endif
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