| // 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_ALWAYS_TRUE_PREDICATE_HPP |
| #define BOOST_PARAMETER_AUX_ALWAYS_TRUE_PREDICATE_HPP |
| |
| #include <boost/parameter/config.hpp> |
| #include <boost/mpl/bool.hpp> |
| |
| #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
| #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| #include <boost/mp11/integral.hpp> |
| #endif |
| #else |
| #include <boost/mpl/always.hpp> |
| #endif |
| |
| namespace boost { namespace parameter { namespace aux { |
| |
| #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
| struct always_true_predicate |
| { |
| template <typename ...> |
| struct apply |
| { |
| typedef ::boost::mpl::true_ type; |
| }; |
| |
| #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| template <typename ...> |
| using fn = ::boost::mp11::mp_true; |
| #endif |
| }; |
| #else |
| typedef ::boost::mpl::always< ::boost::mpl::true_> always_true_predicate; |
| #endif // BOOST_NO_CXX11_VARIADIC_TEMPLATES |
| }}} // namespace boost::parameter::aux |
| |
| #endif // include guard |
| |