| // Copyright David Abrahams 2006. |
| // 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_TYPE_HPP |
| #define BOOST_PARAMETER_AUX_PREPROCESSOR_IMPL_PARENTHESIZED_TYPE_HPP |
| |
| namespace boost { namespace parameter { namespace aux { |
| |
| // A metafunction that transforms void(*)(T) -> T |
| template <typename UnaryFunctionPointer> |
| struct unaryfunptr_arg_type; |
| |
| template <typename Arg> |
| struct unaryfunptr_arg_type<void(*)(Arg)> |
| { |
| typedef Arg type; |
| }; |
| |
| template <> |
| struct unaryfunptr_arg_type<void(*)(void)> |
| { |
| typedef void type; |
| }; |
| }}} // namespace boost::parameter::aux |
| |
| // A macro that takes a parenthesized C++ type name (T) and transforms it |
| // into an un-parenthesized type expression equivalent to T. |
| #define BOOST_PARAMETER_PARENTHESIZED_TYPE(x) \ |
| ::boost::parameter::aux::unaryfunptr_arg_type< void(*)x >::type |
| |
| #endif // include guard |
| |