| // Copyright Cromwell D. Enage 2019. |
| // 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) |
| |
| #ifndef BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_PARENTHESIZED_RETURN_TYPE_HPP |
| #define BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_PARENTHESIZED_RETURN_TYPE_HPP |
| |
| namespace boost { namespace parameter { namespace aux { |
| |
| // A metafunction that transforms void(*)(T) -> identity<T> |
| template <typename UnaryFunctionPointer> |
| struct unaryfunptr_return_type; |
| }}} // namespace boost::parameter::aux |
| |
| #include <boost/parameter/config.hpp> |
| |
| #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| #include <boost/mp11/utility.hpp> |
| #else |
| #include <boost/mpl/identity.hpp> |
| #endif |
| |
| namespace boost { namespace parameter { namespace aux { |
| |
| template <typename Arg> |
| struct unaryfunptr_return_type<void(*)(Arg)> |
| { |
| #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| using type = ::boost::mp11::mp_identity<Arg>; |
| #else |
| typedef ::boost::mpl::identity<Arg> type; |
| #endif |
| }; |
| |
| template <> |
| struct unaryfunptr_return_type<void(*)(void)> |
| { |
| #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| using type = ::boost::mp11::mp_identity<void>; |
| #else |
| typedef ::boost::mpl::identity<void> type; |
| #endif |
| }; |
| }}} // namespace boost::parameter::aux |
| |
| #if !defined(BOOST_NO_SFINAE) |
| #include <boost/core/enable_if.hpp> |
| |
| namespace boost { namespace parameter { namespace aux { |
| |
| template <typename Pred, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::enable_if<Pred,Ret>)> |
| { |
| typedef ::boost::enable_if<Pred,Ret> type; |
| }; |
| |
| template <bool b, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::enable_if_c<b,Ret>)> |
| { |
| typedef ::boost::enable_if_c<b,Ret> type; |
| }; |
| |
| template <typename Pred, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::lazy_enable_if<Pred,Ret>)> |
| { |
| typedef ::boost::lazy_enable_if<Pred,Ret> type; |
| }; |
| |
| template <bool b, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::lazy_enable_if_c<b,Ret>)> |
| { |
| typedef ::boost::lazy_enable_if_c<b,Ret> type; |
| }; |
| |
| template <typename Pred, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::disable_if<Pred,Ret>)> |
| { |
| typedef ::boost::disable_if<Pred,Ret> type; |
| }; |
| |
| template <bool b, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::disable_if_c<b,Ret>)> |
| { |
| typedef ::boost::disable_if_c<b,Ret> type; |
| }; |
| |
| template <typename B, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::lazy_disable_if<B,Ret>)> |
| { |
| typedef ::boost::lazy_disable_if<B,Ret> type; |
| }; |
| |
| template <bool b, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::boost::lazy_disable_if_c<b,Ret>)> |
| { |
| typedef ::boost::lazy_disable_if_c<b,Ret> type; |
| }; |
| }}} // namespace boost::parameter::aux |
| |
| #if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS) |
| #include <type_traits> |
| |
| namespace boost { namespace parameter { namespace aux { |
| |
| template <bool b, typename Ret> |
| struct unaryfunptr_return_type<void(*)(::std::enable_if<b,Ret>)> |
| { |
| typedef ::std::enable_if<b,Ret> type; |
| }; |
| }}} // namespace boost::parameter::aux |
| |
| #endif // BOOST_NO_CXX11_HDR_TYPE_TRAITS |
| #endif // BOOST_NO_SFINAE |
| |
| // A macro that takes a parenthesized C++ type name (T) and transforms it |
| // into an un-parenthesized type expression equivalent to identity<T>. |
| #define BOOST_PARAMETER_PARENTHESIZED_RETURN_TYPE(x) \ |
| ::boost::parameter::aux::unaryfunptr_return_type< void(*)x >::type |
| |
| #endif // include guard |
| |