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- // 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
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