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50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
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/*!
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@file
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Forward declares `boost::hana::reverse`.
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@copyright Louis Dionne 2013-2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_FWD_REVERSE_HPP
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#define BOOST_HANA_FWD_REVERSE_HPP
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#include <boost/hana/config.hpp>
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#include <boost/hana/core/when.hpp>
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BOOST_HANA_NAMESPACE_BEGIN
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//! Reverse a sequence.
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//! @ingroup group-Sequence
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//!
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//! Specifically, `reverse(xs)` is a new sequence containing the same
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//! elements as `xs`, except in reverse order.
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//!
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//!
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//! @param xs
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//! The sequence to reverse.
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//!
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//!
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//! Example
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//! -------
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//! @include example/reverse.cpp
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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constexpr auto reverse = [](auto&& xs) {
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return tag-dispatched;
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};
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#else
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template <typename S, typename = void>
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struct reverse_impl : reverse_impl<S, when<true>> { };
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struct reverse_t {
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template <typename Xs>
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constexpr auto operator()(Xs&& xs) const;
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};
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constexpr reverse_t reverse{};
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#endif
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_FWD_REVERSE_HPP
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