54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
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/*!
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@file
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Forward declares `boost::hana::any_of`.
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@copyright Louis Dionne 2013-2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_FWD_ANY_OF_HPP
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#define BOOST_HANA_FWD_ANY_OF_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/when.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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//! Returns whether any key of the structure satisfies the `predicate`.
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//! @ingroup group-Searchable
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//!
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//! If the structure is not finite, `predicate` has to be satisfied
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//! after looking at a finite number of keys for this method to finish.
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//!
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//!
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//! @param xs
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//! The structure to search.
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//!
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//! @param predicate
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//! A function called as `predicate(k)`, where `k` is a key of the
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//! structure, and returning a `Logical`.
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//!
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//!
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//! Example
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//! -------
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//! @include example/any_of.cpp
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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constexpr auto any_of = [](auto&& xs, auto&& predicate) {
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return tag-dispatched;
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};
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#else
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template <typename S, typename = void>
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struct any_of_impl : any_of_impl<S, when<true>> { };
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struct any_of_t {
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template <typename Xs, typename Pred>
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constexpr auto operator()(Xs&& xs, Pred&& pred) const;
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};
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constexpr any_of_t any_of{};
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#endif
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_FWD_ANY_OF_HPP
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