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

   1 /*!
   2 @file
   3 Forward declares `boost::hana::any_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_ANY_OF_HPP
  11 #define BOOST_HANA_FWD_ANY_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 any key of the structure satisfies the `predicate`.
  19     //! @ingroup group-Searchable
  20     //!
  21     //! If the structure is not finite, `predicate` has to be satisfied
  22     //! after looking at a finite number of keys for this method to finish.
  23     //!
  24     //!
  25     //! @param xs
  26     //! The structure to search.
  27     //!
  28     //! @param predicate
  29     //! A function called as `predicate(k)`, where `k` is a key of the
  30     //! structure, and returning a `Logical`.
  31     //!
  32     //!
  33     //! Example
  34     //! -------
  35     //! @include example/any_of.cpp
  36 #ifdef BOOST_HANA_DOXYGEN_INVOKED
  37     constexpr auto any_of = [](auto&& xs, auto&& predicate) {
  38         return tag-dispatched;
  39     };
  40 #else
  41     template <typename S, typename = void>
  42     struct any_of_impl : any_of_impl<S, when<true>> { };
  43
  44     struct any_of_t {
  45         template <typename Xs, typename Pred>
  46         constexpr auto operator()(Xs&& xs, Pred&& pred) const;
  47     };
  48
  49     constexpr any_of_t any_of{};
  50 #endif
  51 BOOST_HANA_NAMESPACE_END
  52
  53 #endif // !BOOST_HANA_FWD_ANY_OF_HPP