ceph/src/boost/boost/parameter/aux_/always_true_predicate.hpp

   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