ceph/src/boost/libs/hana/include/boost/hana/detail/wrong.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::detail::wrong`.
   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_DETAIL_WRONG_HPP
  11 #define BOOST_HANA_DETAIL_WRONG_HPP
  12
  13 #include <boost/hana/config.hpp>
  14
  15 #include <type_traits>
  16
  17
  18 BOOST_HANA_NAMESPACE_BEGIN namespace detail {
  19     //! @ingroup group-detail
  20     //! Equivalent to a type-dependent `std::false_type`.
  21     //!
  22     //! This is useful for making a static assertion that would otherwise
  23     //! always fire up dependent on some template parameters.
  24     //!
  25     //!
  26     //! Example
  27     //! -------
  28     //! @include example/detail/wrong.cpp
  29     template <typename ...>
  30     struct wrong : std::false_type { };
  31 } BOOST_HANA_NAMESPACE_END
  32
  33 #endif // !BOOST_HANA_DETAIL_WRONG_HPP