47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
/*!
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@file
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Forward declares `boost::hana::members`.
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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_MEMBERS_HPP
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#define BOOST_HANA_FWD_MEMBERS_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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//! Returns a `Sequence` containing the members of a `Struct`.
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//! @ingroup group-Struct
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//!
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//! Given a `Struct` object, `members` returns a `Sequence` containing
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//! all the members of the `Struct`, in the same order as their respective
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//! accessor appears in the `accessors` sequence.
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//!
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//!
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//! Example
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//! -------
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//! @include example/members.cpp
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#ifdef BOOST_HANA_DOXYGEN_INVOKED
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constexpr auto members = [](auto&& object) {
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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 members_impl : members_impl<S, when<true>> { };
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struct members_t {
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template <typename Object>
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constexpr auto operator()(Object&& object) const;
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};
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constexpr members_t members{};
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#endif
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BOOST_HANA_NAMESPACE_END
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#endif // !BOOST_HANA_FWD_MEMBERS_HPP
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