| //----------------------------------------------------------------------------- |
| // boost variant/detail/apply_visitor_unary.hpp header file |
| // See http://www.boost.org for updates, documentation, and revision history. |
| //----------------------------------------------------------------------------- |
| // |
| // Copyright (c) 2002-2003 |
| // Eric Friedman |
| // |
| // 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_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP |
| #define BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP |
| |
| #include "boost/config.hpp" |
| #include "boost/detail/workaround.hpp" |
| #include "boost/variant/detail/generic_result_type.hpp" |
| |
| #if BOOST_WORKAROUND(__EDG__, BOOST_TESTED_AT(302)) |
| #include "boost/utility/enable_if.hpp" |
| #include "boost/mpl/not.hpp" |
| #include "boost/type_traits/is_const.hpp" |
| #endif |
| |
| namespace boost { |
| |
| ////////////////////////////////////////////////////////////////////////// |
| // function template apply_visitor(visitor, visitable) |
| // |
| // Visits visitable with visitor. |
| // |
| |
| // |
| // nonconst-visitor version: |
| // |
| |
| #if !BOOST_WORKAROUND(__EDG__, BOOST_TESTED_AT(302)) |
| |
| # define BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(V) \ |
| BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename V::result_type) \ |
| /**/ |
| |
| #else // EDG-based compilers |
| |
| # define BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(V) \ |
| typename enable_if< \ |
| mpl::not_< is_const< V > > \ |
| , BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename V::result_type) \ |
| >::type \ |
| /**/ |
| |
| #endif // EDG-based compilers workaround |
| |
| template <typename Visitor, typename Visitable> |
| inline |
| BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(Visitor) |
| apply_visitor(Visitor& visitor, Visitable& visitable) |
| { |
| return visitable.apply_visitor(visitor); |
| } |
| |
| #undef BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE |
| |
| // |
| // const-visitor version: |
| // |
| |
| #if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) |
| |
| template <typename Visitor, typename Visitable> |
| inline |
| BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename Visitor::result_type) |
| apply_visitor(const Visitor& visitor, Visitable& visitable) |
| { |
| return visitable.apply_visitor(visitor); |
| } |
| |
| #endif // MSVC7 and below exclusion |
| |
| } // namespace boost |
| |
| #endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP |