ceph/src/boost/libs/hana/include/boost/hana/fwd/all_of.hpp

   1 /*!
   2 @file
   3 Forward declares `boost::hana::all_of`.
   4
   5 @copyright Louis Dionne 2013-2016
   6 Distributed under the Boost Software License, Version 1.0.
   7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_HANA_FWD_ALL_OF_HPP
  11 #define BOOST_HANA_FWD_ALL_OF_HPP
  12
  13 #include <boost/hana/config.hpp>
  14 #include <boost/hana/core/when.hpp>
  15
  16
  17 BOOST_HANA_NAMESPACE_BEGIN
  18     //! Returns whether all the keys of the structure satisfy the `predicate`.
  19     //! @ingroup group-Searchable
  20     //!
  21     //! If the structure is not finite, `predicate` has to return a false-
  22     //! valued `Logical` after looking at a finite number of keys for this
  23     //! method to finish.
  24     //!
  25     //!
  26     //! @param xs
  27     //! The structure to search.
  28     //!
  29     //! @param predicate
  30     //! A function called as `predicate(k)`, where `k` is a key of the
  31     //! structure, and returning a `Logical`.
  32     //!
  33     //!
  34     //! Example
  35     //! -------
  36     //! @include example/all_of.cpp
  37 #ifdef BOOST_HANA_DOXYGEN_INVOKED
  38     constexpr auto all_of = [](auto&& xs, auto&& predicate) {
  39         return tag-dispatched;
  40     };
  41 #else
  42     template <typename S, typename = void>
  43     struct all_of_impl : all_of_impl<S, when<true>> { };
  44
  45     struct all_of_t {
  46         template <typename Xs, typename Pred>
  47         constexpr auto operator()(Xs&& xs, Pred&& pred) const;
  48     };
  49
  50     constexpr all_of_t all_of{};
  51 #endif
  52 BOOST_HANA_NAMESPACE_END
  53
  54 #endif // !BOOST_HANA_FWD_ALL_OF_HPP