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/*!
@file
Forward declares `boost::hana::all`.
@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_FWD_ALL_HPP
#define BOOST_HANA_FWD_ALL_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
BOOST_HANA_NAMESPACE_BEGIN
//! Returns whether all the keys of the structure are true-valued.
//! @ingroup group-Searchable
//!
//! The keys of the structure must be `Logical`s. If the structure is not
//! finite, a false-valued key must appear at a finite "index" in order
//! for this method to finish.
//!
//!
//! Example
//! -------
//! @include example/all.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto all = [](auto&& xs) {
return tag-dispatched;
};
#else
template <typename S, typename = void>
struct all_impl : all_impl<S, when<true>> { };
struct all_t {
template <typename Xs>
constexpr auto operator()(Xs&& xs) const;
};
constexpr all_t all{};
#endif
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FWD_ALL_HPP
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