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// Boost.TypeErasure library
//
// Copyright 2012 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_CHECK_CALL_HPP_INCLUDED
#define BOOST_TYPE_ERASURE_DETAIL_CHECK_CALL_HPP_INCLUDED
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/and.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/type_traits/is_reference.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/type_traits/function_traits.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
#include <boost/preprocessor/repetition/repeat.hpp>
#include <boost/preprocessor/cat.hpp>
#include <boost/type_erasure/placeholder_of.hpp>
namespace boost {
namespace type_erasure {
namespace detail {
template<class Sig, class Args>
struct check_call : ::boost::mpl::false_ {};
template<class T, class Enable = void>
struct qualified_placeholder
{
typedef void type;
};
template<class T>
struct qualified_placeholder<T&, typename T::_boost_type_erasure_is_any>
{
typedef typename ::boost::type_erasure::placeholder_of<T>::type placeholder;
typedef typename ::boost::remove_reference<placeholder>::type unref;
typedef typename ::boost::mpl::if_< ::boost::is_const<T>,
const unref,
unref
>::type add_const;
typedef typename ::boost::mpl::if_< ::boost::is_reference<placeholder>,
placeholder,
add_const&
>::type type;
};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class T>
struct qualified_placeholder<T&&, typename T::_boost_type_erasure_is_any>
{
typedef typename ::boost::type_erasure::placeholder_of<T>::type placeholder;
typedef placeholder&& type;
};
#endif
template<class P, class A>
struct check_placeholder_arg_impl : ::boost::mpl::false_ {};
template<class P>
struct check_placeholder_arg_impl<P, P&> : ::boost::mpl::true_ {};
template<class P>
struct check_placeholder_arg_impl<P, const P&> : ::boost::mpl::true_ {};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class P>
struct check_placeholder_arg_impl<P, P&&> : ::boost::mpl::true_ {};
#endif
template<class P>
struct check_placeholder_arg_impl<P&, P&> : ::boost::mpl::true_ {};
template<class P>
struct check_placeholder_arg_impl<const P&, P&> : ::boost::mpl::true_ {};
template<class P>
struct check_placeholder_arg_impl<const P&, const P&> : ::boost::mpl::true_ {};
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template<class P>
struct check_placeholder_arg_impl<const P&, P&&> : ::boost::mpl::true_ {};
template<class P>
struct check_placeholder_arg_impl<P&&, P&&> : ::boost::mpl::true_ {};
#endif
template<class P, class Arg>
struct check_placeholder_arg :
check_placeholder_arg_impl<
P,
typename ::boost::type_erasure::detail::qualified_placeholder<Arg>::type
>::type
{};
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
((defined(__GNUC__) && !(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 6))) || \
defined(__MINGW32__) || defined(__MINGW64__) || \
BOOST_WORKAROUND(BOOST_MSVC, <= 1700))
#define BOOST_TYPE_ERASURE_BROKEN_RVALUE_IS_CONVERTIBLE
#endif
#ifdef BOOST_TYPE_ERASURE_USE_MP11
template<class P, class Arg>
using check_placeholder_arg_t =
typename ::boost::type_erasure::detail::check_placeholder_arg_impl<
P,
typename ::boost::type_erasure::detail::qualified_placeholder<Arg>::type
>::type;
template<class T, class Arg>
using check_nonplaceholder_arg_t = typename ::boost::is_convertible<Arg, T>::type;
template<class FormalArg, class ActualArg>
using check_arg_t =
::boost::type_erasure::detail::eval_if<
::boost::type_erasure::is_placeholder<
::boost::remove_cv_t<
::boost::remove_reference_t<FormalArg>
>
>::value,
::boost::type_erasure::detail::check_placeholder_arg_t,
::boost::type_erasure::detail::check_nonplaceholder_arg_t,
FormalArg,
ActualArg
>;
// MSVC 14.1 ICE's if we use check_arg_t directly.
template<class FormalArg, class ActualArg>
struct check_arg
{
typedef ::boost::type_erasure::detail::check_arg_t<FormalArg, ActualArg> type;
};
template<class R, class... T, class... U>
struct check_call<R(T...), void(U...)> {
typedef ::boost::mp11::mp_all<
typename ::boost::type_erasure::detail::check_arg<T, U>::type...
> type;
};
#else
template<class FormalArg, class ActualArg>
struct check_arg
{
typedef typename ::boost::mpl::eval_if<
is_placeholder<
typename ::boost::remove_cv<
typename ::boost::remove_reference<FormalArg>::type
>::type
>,
::boost::type_erasure::detail::check_placeholder_arg<FormalArg, ActualArg>,
#ifdef BOOST_TYPE_ERASURE_BROKEN_RVALUE_IS_CONVERTIBLE
::boost::mpl::true_
#else
::boost::is_convertible<ActualArg, FormalArg>
#endif
>::type type;
};
#ifdef BOOST_NO_CXX11_VARIADIC_TEMPLATES
#define BOOST_PP_FILENAME_1 <boost/type_erasure/detail/check_call.hpp>
#define BOOST_PP_ITERATION_LIMITS (0, BOOST_TYPE_ERASURE_MAX_ARITY)
#include BOOST_PP_ITERATE()
#else
template<class... B>
struct and_;
template<class T1, class... T>
struct and_<T1, T...> : boost::mpl::eval_if_c<T1::type::value, and_<T...>, boost::mpl::false_>::type {};
template<class T1>
struct and_<T1> : T1::type {};
template<>
struct and_<> : boost::mpl::true_ {};
template<class R, class... T, class... U>
struct check_call<R(T...), void(U...)> {
typedef typename ::boost::type_erasure::detail::and_<
::boost::type_erasure::detail::check_arg<T, U>...
>::type type;
};
#endif
#endif
}
}
}
#endif
#else
#define N BOOST_PP_ITERATION()
#define BOOST_TYPE_ERASURE_CHECK_ARG(z, n, data) \
typedef typename ::boost::type_erasure::detail::check_arg< \
BOOST_PP_CAT(T, n), \
BOOST_PP_CAT(U, n) \
>::type BOOST_PP_CAT(check, n); \
typedef typename ::boost::mpl::and_< \
BOOST_PP_CAT(type, n), \
BOOST_PP_CAT(check, n) \
>::type BOOST_PP_CAT(type, BOOST_PP_INC(n));
template<
class R
BOOST_PP_ENUM_TRAILING_PARAMS(N, class T)
BOOST_PP_ENUM_TRAILING_PARAMS(N, class U)
>
struct check_call<R(BOOST_PP_ENUM_PARAMS(N, T)), void(BOOST_PP_ENUM_BINARY_PARAMS(N, U, u))> {
typedef ::boost::mpl::true_ type0;
BOOST_PP_REPEAT(N, BOOST_TYPE_ERASURE_CHECK_ARG, ~)
typedef BOOST_PP_CAT(type, N) type;
};
#undef N
#endif
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