3 Forward declares `boost::hana::and_`.
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)
10 #ifndef BOOST_HANA_FWD_AND_HPP
11 #define BOOST_HANA_FWD_AND_HPP
13 #include <boost/hana/config.hpp>
14 #include <boost/hana/core/when.hpp>
17 BOOST_HANA_NAMESPACE_BEGIN
18 //! Return whether all the arguments are true-valued.
19 //! @ingroup group-Logical
21 //! `and_` can be called with one argument or more. When called with
22 //! two arguments, `and_` uses tag-dispatching to find the right
23 //! implementation. Otherwise,
26 //! and_(x, y, ...z) == and_(and_(x, y), z...)
32 //! @include example/and.cpp
33 #ifdef BOOST_HANA_DOXYGEN_INVOKED
34 constexpr auto and_ = [](auto&& x, auto&& ...y) -> decltype(auto) {
35 return tag-dispatched;
38 template <typename L, typename = void>
39 struct and_impl : and_impl<L, when<true>> { };
42 template <typename X, typename Y>
43 constexpr decltype(auto) operator()(X&& x, Y&& y) const;
45 template <typename X, typename ...Y>
46 constexpr decltype(auto) operator()(X&& x, Y&& ...y) const;
49 constexpr and_t and_{};
51 BOOST_HANA_NAMESPACE_END
53 #endif // !BOOST_HANA_FWD_AND_HPP