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Diffstat (limited to 'boost/hana/fwd/all_of.hpp')
| -rw-r--r-- | boost/hana/fwd/all_of.hpp | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/boost/hana/fwd/all_of.hpp b/boost/hana/fwd/all_of.hpp new file mode 100644 index 0000000000..33fcbfc96d --- /dev/null +++ b/boost/hana/fwd/all_of.hpp @@ -0,0 +1,54 @@ +/*! +@file +Forward declares `boost::hana::all_of`. + +@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_OF_HPP +#define BOOST_HANA_FWD_ALL_OF_HPP + +#include <boost/hana/config.hpp> +#include <boost/hana/core/when.hpp> + + +BOOST_HANA_NAMESPACE_BEGIN + //! Returns whether all the keys of the structure satisfy the `predicate`. + //! @ingroup group-Searchable + //! + //! If the structure is not finite, `predicate` has to return a false- + //! valued `Logical` 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/all_of.cpp +#ifdef BOOST_HANA_DOXYGEN_INVOKED + constexpr auto all_of = [](auto&& xs, auto&& predicate) { + return tag-dispatched; + }; +#else + template <typename S, typename = void> + struct all_of_impl : all_of_impl<S, when<true>> { }; + + struct all_of_t { + template <typename Xs, typename Pred> + constexpr auto operator()(Xs&& xs, Pred&& pred) const; + }; + + constexpr all_of_t all_of{}; +#endif +BOOST_HANA_NAMESPACE_END + +#endif // !BOOST_HANA_FWD_ALL_OF_HPP |