| 1 | // Copyright Cromwell D. Enage 2019. |
|---|---|
| 2 | // Distributed under the Boost Software License, Version 1.0. |
| 3 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 4 | // http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | #ifndef BOOST_PARAMETER_AUX_ALWAYS_TRUE_PREDICATE_HPP |
| 7 | #define BOOST_PARAMETER_AUX_ALWAYS_TRUE_PREDICATE_HPP |
| 8 | |
| 9 | #include <boost/parameter/config.hpp> |
| 10 | #include <boost/mpl/bool.hpp> |
| 11 | |
| 12 | #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
| 13 | #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| 14 | #include <boost/mp11/integral.hpp> |
| 15 | #endif |
| 16 | #else |
| 17 | #include <boost/mpl/always.hpp> |
| 18 | #endif |
| 19 | |
| 20 | namespace boost { namespace parameter { namespace aux { |
| 21 | |
| 22 | #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) |
| 23 | struct always_true_predicate |
| 24 | { |
| 25 | template <typename ...> |
| 26 | struct apply |
| 27 | { |
| 28 | typedef ::boost::mpl::true_ type; |
| 29 | }; |
| 30 | |
| 31 | #if defined(BOOST_PARAMETER_CAN_USE_MP11) |
| 32 | template <typename ...> |
| 33 | using fn = ::boost::mp11::mp_true; |
| 34 | #endif |
| 35 | }; |
| 36 | #else |
| 37 | typedef ::boost::mpl::always< ::boost::mpl::true_> always_true_predicate; |
| 38 | #endif // BOOST_NO_CXX11_VARIADIC_TEMPLATES |
| 39 | }}} // namespace boost::parameter::aux |
| 40 | |
| 41 | #endif // include guard |
| 42 | |
| 43 |