| // (C) Copyright Jeremy Siek 2000. |
| // 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) |
| |
| // This header replaces the implementation of ct_if that preceded the |
| // introduction of Boost.MPL with a facade that defers to that reviewed and |
| // accepted library. |
| |
| // Author: Ronald Garcia |
| // Date: 20 October, 2006 |
| |
| |
| #ifndef BOOST_CT_IF_HPP |
| #define BOOST_CT_IF_HPP |
| |
| |
| // A stub implementation in terms of Boost.MPL |
| |
| #include <boost/mpl/if.hpp> |
| #include <boost/mpl/not.hpp> |
| #include <boost/mpl/and.hpp> |
| // true_type and false_type are used by applications of ct_if |
| #include <boost/type_traits/integral_constant.hpp> |
| |
| namespace boost { |
| |
| template <class A, class B> |
| struct ct_and : boost::mpl::and_<A,B> {}; |
| |
| template <class A> |
| struct ct_not : mpl::not_<A> {}; |
| |
| template <bool cond, class A, class B> |
| struct ct_if : mpl::if_c<cond,A,B> {}; |
| |
| template <class cond, class A, class B> |
| struct ct_if_t : mpl::if_<cond,A,B> {}; |
| |
| } // namespace boost |
| |
| #endif // BOOST_CT_IF_HPP |
| |
