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/*!
@file
Forward declares `boost::hana::any_of`.
@copyright Louis Dionne 2013-2017
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_FWD_ANY_OF_HPP
#define BOOST_HANA_FWD_ANY_OF_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
BOOST_HANA_NAMESPACE_BEGIN
//! Returns whether any key of the structure satisfies the `predicate`.
//! @ingroup group-Searchable
//!
//! If the structure is not finite, `predicate` has to be satisfied
//! after looking at a finite number of keys for this method to finish.
//!
//!
//! @param xs
//! The structure to search.
//!
//! @param predicate
//! A function called as `predicate(k)`, where `k` is a key of the
//! structure, and returning a `Logical`.
//!
//!
//! Example
//! -------
//! @include example/any_of.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto any_of = [](auto&& xs, auto&& predicate) {
return tag-dispatched;
};
#else
template <typename S, typename = void>
struct any_of_impl : any_of_impl<S, when<true>> { };
struct any_of_t {
template <typename Xs, typename Pred>
constexpr auto operator()(Xs&& xs, Pred&& pred) const;
};
constexpr any_of_t any_of{};
#endif
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FWD_ANY_OF_HPP
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