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Diffstat (limited to 'boost/hana/any.hpp')
-rw-r--r-- | boost/hana/any.hpp | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/boost/hana/any.hpp b/boost/hana/any.hpp new file mode 100644 index 0000000000..48670fb50b --- /dev/null +++ b/boost/hana/any.hpp @@ -0,0 +1,48 @@ +/*! +@file +Defines `boost::hana::any`. + +@copyright Louis Dionne 2013-2016 +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_ANY_HPP +#define BOOST_HANA_ANY_HPP + +#include <boost/hana/fwd/any.hpp> + +#include <boost/hana/any_of.hpp> +#include <boost/hana/concept/searchable.hpp> +#include <boost/hana/config.hpp> +#include <boost/hana/core/dispatch.hpp> +#include <boost/hana/functional/id.hpp> + + +BOOST_HANA_NAMESPACE_BEGIN + //! @cond + template <typename Xs> + constexpr auto any_t::operator()(Xs&& xs) const { + using S = typename hana::tag_of<Xs>::type; + using Any = BOOST_HANA_DISPATCH_IF(any_impl<S>, + hana::Searchable<S>::value + ); + + #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS + static_assert(hana::Searchable<S>::value, + "hana::any(xs) requires 'xs' to be a Searchable"); + #endif + + return Any::apply(static_cast<Xs&&>(xs)); + } + //! @endcond + + template <typename S, bool condition> + struct any_impl<S, when<condition>> : default_ { + template <typename Xs> + static constexpr auto apply(Xs&& xs) + { return hana::any_of(static_cast<Xs&&>(xs), hana::id); } + }; +BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_ANY_HPP |