ceph/src/boost/libs/hana/include/boost/hana/is_disjoint.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::is_disjoint`.
   4
   5 @copyright Louis Dionne 2013-2016
   6 Distributed under the Boost Software License, Version 1.0.
   7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_HANA_IS_DISJOINT_HPP
  11 #define BOOST_HANA_IS_DISJOINT_HPP
  12
  13 #include <boost/hana/fwd/is_disjoint.hpp>
  14
  15 #include <boost/hana/concept/searchable.hpp>
  16 #include <boost/hana/config.hpp>
  17 #include <boost/hana/contains.hpp>
  18 #include <boost/hana/core/dispatch.hpp>
  19 #include <boost/hana/none_of.hpp>
  20
  21
  22 BOOST_HANA_NAMESPACE_BEGIN
  23     //! @cond
  24     template <typename Xs, typename Ys>
  25     constexpr auto is_disjoint_t::operator()(Xs&& xs, Ys&& ys) const {
  26         using S1 = typename hana::tag_of<Xs>::type;
  27         using S2 = typename hana::tag_of<Ys>::type;
  28         using IsDisjoint = BOOST_HANA_DISPATCH_IF(
  29             decltype(is_disjoint_impl<S1, S2>{}),
  30             hana::Searchable<S1>::value &&
  31             hana::Searchable<S2>::value
  32         );
  33
  34     #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
  35         static_assert(hana::Searchable<S1>::value,
  36         "hana::is_disjoint(xs, ys) requires 'xs' to be Searchable");
  37
  38         static_assert(hana::Searchable<S2>::value,
  39         "hana::is_disjoint(xs, ys) requires 'ys' to be Searchable");
  40     #endif
  41
  42         return IsDisjoint::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys));
  43     }
  44     //! @endcond
  45
  46     namespace detail {
  47         template <typename Ys>
  48         struct in_by_reference {
  49             Ys const& ys;
  50             template <typename X>
  51             constexpr auto operator()(X const& x) const
  52             { return hana::contains(ys, x); }
  53         };
  54     }
  55
  56     template <typename S1, typename S2, bool condition>
  57     struct is_disjoint_impl<S1, S2, when<condition>> : default_ {
  58         template <typename Xs, typename Ys>
  59         static constexpr auto apply(Xs const& xs, Ys const& ys) {
  60             return hana::none_of(xs, detail::in_by_reference<Ys>{ys});
  61         }
  62     };
  63 BOOST_HANA_NAMESPACE_END
  64
  65 #endif // !BOOST_HANA_IS_DISJOINT_HPP