/usr/include/caf/extend.hpp is in libcaf-dev 0.13.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright (C) 2011 - 2015 *
* Dominik Charousset <dominik.charousset (at) haw-hamburg.de> *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#ifndef CAF_MIXED_HPP
#define CAF_MIXED_HPP
namespace caf {
namespace detail {
template <class D, class B, template <class, class> class... Ms>
struct extend_helper;
template <class D, class B>
struct extend_helper<D, B> {
using type = B;
};
template <class D, class B, template <class, class> class M,
template <class, class> class... Ms>
struct extend_helper<D, B, M, Ms...> : extend_helper<D, M<B, D>, Ms...> {
// no content
};
} // namespace detail
/**
* Allows convenient definition of types using mixins.
* For example, `extend<ar, T>::with<ob, fo>` is an alias for
* `fo<ob<ar, T>, T>`.
*
* Mixins always have two template parameters: base type and
* derived type. This allows mixins to make use of the curiously recurring
* template pattern (CRTP). However, if none of the used mixins use CRTP,
* the second template argument can be ignored (it is then set to Base).
*/
template <class Base, class Derived = Base>
struct extend {
/**
* Identifies the combined type.
*/
template <template <class, class> class... Mixins>
using with = typename detail::extend_helper<Derived, Base, Mixins...>::type;
};
} // namespace caf
#endif // CAF_MIXED_HPP
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