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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_GET_PLACEHOLDERS_HPP_INCLUDED
- #define BOOST_TYPE_ERASURE_DETAIL_GET_PLACEHOLDERS_HPP_INCLUDED
- #include <boost/mpl/eval_if.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/mpl/insert.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/type_erasure/detail/meta.hpp>
- #include <boost/type_erasure/config.hpp>
- #include <boost/type_erasure/is_placeholder.hpp>
- namespace boost {
- namespace type_erasure {
- namespace detail {
- #ifdef BOOST_TYPE_ERASURE_USE_MP11
- template<class T>
- struct get_placeholders_in_argument_impl
- {
- template<class Out>
- using apply = ::boost::type_erasure::detail::eval_if<
- ::boost::type_erasure::is_placeholder<T>::value,
- ::boost::mp11::mp_set_push_back,
- ::boost::type_erasure::detail::first,
- Out, T
- >;
- };
- template<class T>
- struct get_placeholders_in_argument_impl<T&>
- {
- template<class Out>
- using apply = typename ::boost::type_erasure::detail::get_placeholders_in_argument_impl<T>::template apply<Out>;
- };
- template<class T>
- struct get_placeholders_in_argument_impl<T&&>
- {
- template<class Out>
- using apply = typename ::boost::type_erasure::detail::get_placeholders_in_argument_impl<T>::template apply<Out>;
- };
- template<class T>
- struct get_placeholders_in_argument_impl<const T>
- {
- template<class Out>
- using apply = typename ::boost::type_erasure::detail::get_placeholders_in_argument_impl<T>::template apply<Out>;
- };
- template<class Out, class T>
- using get_placeholders_f = typename get_placeholders_in_argument_impl<T>::template apply<Out>;
- template<class Out, class... T>
- using get_placeholders_impl =
- ::boost::mp11::mp_fold<
- ::boost::mp11::mp_list<T...>,
- Out,
- ::boost::type_erasure::detail::get_placeholders_f
- >;
- template<class R, class... T>
- struct get_placeholders_in_argument_impl<R(T...)>
- {
- template<class Out>
- using apply = ::boost::type_erasure::detail::get_placeholders_impl<Out, R, T...>;
- };
- template<class R, class C, class... T>
- struct get_placeholders_in_argument_impl<R (C::*)(T...)>
- {
- template<class Out>
- using apply = ::boost::type_erasure::detail::get_placeholders_impl<Out, R, C, T...>;
- };
- template<class R, class C, class... T>
- struct get_placeholders_in_argument_impl<R (C::*)(T...) const>
- {
- template<class Out>
- using apply = ::boost::type_erasure::detail::get_placeholders_impl<Out, R, C, T...>;
- };
- template<class T, class Out>
- struct get_placeholders;
- template<template<class...> class F, class... T, class Out>
- struct get_placeholders<F<T...>, Out>
- {
- using type = ::boost::type_erasure::detail::get_placeholders_impl<Out, T...>;
- };
- template<class T, class Out>
- using get_placeholders_t = typename ::boost::type_erasure::detail::get_placeholders<T, Out>::type;
- #else
- template<class T, class Out>
- struct get_placeholders_in_argument
- {
- typedef typename ::boost::mpl::eval_if<
- ::boost::type_erasure::is_placeholder<T>,
- ::boost::mpl::insert<Out, T>,
- ::boost::mpl::identity<Out>
- >::type type;
- };
- template<class T, class Out>
- struct get_placeholders;
- template<class T, class Out>
- struct get_placeholders_in_argument<T&, Out>
- {
- typedef typename ::boost::type_erasure::detail::get_placeholders_in_argument<
- T,
- Out
- >::type type;
- };
- template<class T, class Out>
- struct get_placeholders_in_argument<const T, Out>
- {
- typedef typename ::boost::type_erasure::detail::get_placeholders_in_argument<
- T,
- Out
- >::type type;
- };
- #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
- template<class Out, class... T>
- struct get_placeholders_impl;
- template<class Out, class T0, class... T>
- struct get_placeholders_impl<Out, T0, T...>
- {
- typedef typename ::boost::type_erasure::detail::get_placeholders_in_argument<
- T0,
- typename get_placeholders_impl<Out, T...>::type
- >::type type;
- };
- template<class Out>
- struct get_placeholders_impl<Out>
- {
- typedef Out type;
- };
- template<template<class...> class T, class... U, class Out>
- struct get_placeholders<T<U...>, Out>
- {
- typedef typename get_placeholders_impl<Out, U...>::type type;
- };
- template<class R, class... T, class Out>
- struct get_placeholders_in_argument<R(T...), Out>
- {
- typedef typename get_placeholders_impl<Out, R, T...>::type type;
- };
- template<class R, class C, class... T, class Out>
- struct get_placeholders_in_argument<R (C::*)(T...), Out>
- {
- typedef typename get_placeholders_impl<Out, R, C, T...>::type type;
- };
- template<class R, class C, class... T, class Out>
- struct get_placeholders_in_argument<R (C::*)(T...) const, Out>
- {
- typedef typename get_placeholders_impl<Out, R, C, T...>::type type;
- };
- #else
- #define BOOST_PP_FILENAME_1 <boost/type_erasure/detail/get_placeholders.hpp>
- #define BOOST_PP_ITERATION_LIMITS (0, BOOST_TYPE_ERASURE_MAX_ARITY)
- #include BOOST_PP_ITERATE()
- #endif
- #endif
- }
- }
- }
- #endif
- #else
- #define N BOOST_PP_ITERATION()
- #define BOOST_TYPE_ERASURE_GET_PLACEHOLDER(z, n, data) \
- typedef typename ::boost::type_erasure::detail::get_placeholders_in_argument< \
- BOOST_PP_CAT(data, n), BOOST_PP_CAT(type, n)>::type \
- BOOST_PP_CAT(type, BOOST_PP_INC(n));
- #if N != 0
- template<template<BOOST_PP_ENUM_PARAMS(N, class T)> class T,
- BOOST_PP_ENUM_PARAMS(N, class T), class Out>
- struct get_placeholders<T<BOOST_PP_ENUM_PARAMS(N, T)>, Out>
- {
- typedef Out type0;
- BOOST_PP_REPEAT(N, BOOST_TYPE_ERASURE_GET_PLACEHOLDER, T)
- typedef BOOST_PP_CAT(type, N) type;
- };
- #endif
- template<class R
- BOOST_PP_ENUM_TRAILING_PARAMS(N, class T), class Out>
- struct get_placeholders_in_argument<R(BOOST_PP_ENUM_PARAMS(N, T)), Out>
- {
- typedef typename ::boost::type_erasure::detail::get_placeholders_in_argument<
- R,
- Out
- >::type type0;
- BOOST_PP_REPEAT(N, BOOST_TYPE_ERASURE_GET_PLACEHOLDER, T)
- typedef BOOST_PP_CAT(type, N) type;
- };
- #undef BOOST_TYPE_ERASURE_GET_PLACEHOLDER
- #undef N
- #endif
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