1 /*!
2 @file
3 Defines `boost::hana::detail::wrong`.
4 
5 @copyright Louis Dionne 2013-2017
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
34