63e88f80
 Hu Chunming
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/*!
@file
Defines `boost::hana::is_disjoint`.
Copyright Louis Dionne 2013-2022
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_IS_DISJOINT_HPP
#define BOOST_HANA_IS_DISJOINT_HPP
#include <boost/hana/fwd/is_disjoint.hpp>
#include <boost/hana/concept/searchable.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/contains.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/none_of.hpp>
namespace boost { namespace hana {
//! @cond
template <typename Xs, typename Ys>
constexpr auto is_disjoint_t::operator()(Xs&& xs, Ys&& ys) const {
using S1 = typename hana::tag_of<Xs>::type;
using S2 = typename hana::tag_of<Ys>::type;
using IsDisjoint = BOOST_HANA_DISPATCH_IF(
decltype(is_disjoint_impl<S1, S2>{}),
hana::Searchable<S1>::value &&
hana::Searchable<S2>::value
);
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(hana::Searchable<S1>::value,
"hana::is_disjoint(xs, ys) requires 'xs' to be Searchable");
static_assert(hana::Searchable<S2>::value,
"hana::is_disjoint(xs, ys) requires 'ys' to be Searchable");
#endif
return IsDisjoint::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys));
}
//! @endcond
namespace detail {
template <typename Ys>
struct in_by_reference {
Ys const& ys;
template <typename X>
constexpr auto operator()(X const& x) const
{ return hana::contains(ys, x); }
};
}
template <typename S1, typename S2, bool condition>
struct is_disjoint_impl<S1, S2, when<condition>> : default_ {
template <typename Xs, typename Ys>
static constexpr auto apply(Xs const& xs, Ys const& ys) {
return hana::none_of(xs, detail::in_by_reference<Ys>{ys});
}
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_IS_DISJOINT_HPP
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