3 Defines `boost::hana::any`.
5 @copyright Louis Dionne 2013-2017
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)
10 #ifndef BOOST_HANA_ANY_HPP
11 #define BOOST_HANA_ANY_HPP
13 #include <boost/hana/fwd/any.hpp>
15 #include <boost/hana/any_of.hpp>
16 #include <boost/hana/concept/searchable.hpp>
17 #include <boost/hana/config.hpp>
18 #include <boost/hana/core/dispatch.hpp>
19 #include <boost/hana/functional/id.hpp>
22 BOOST_HANA_NAMESPACE_BEGIN
24 template <typename Xs>
25 constexpr auto any_t::operator()(Xs&& xs) const {
26 using S = typename hana::tag_of<Xs>::type;
27 using Any = BOOST_HANA_DISPATCH_IF(any_impl<S>,
28 hana::Searchable<S>::value
31 #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
32 static_assert(hana::Searchable<S>::value,
33 "hana::any(xs) requires 'xs' to be a Searchable");
36 return Any::apply(static_cast<Xs&&>(xs));
40 template <typename S, bool condition>
41 struct any_impl<S, when<condition>> : default_ {
42 template <typename Xs>
43 static constexpr auto apply(Xs&& xs)
44 { return hana::any_of(static_cast<Xs&&>(xs), hana::id); }
46 BOOST_HANA_NAMESPACE_END
48 #endif // !BOOST_HANA_ANY_HPP