35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
/*!
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@file
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Defines `boost::hana::detail::operators::adl`.
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@copyright Louis Dionne 2013-2017
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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_DETAIL_OPERATORS_ADL_HPP
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#define BOOST_HANA_DETAIL_OPERATORS_ADL_HPP
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#include <boost/hana/config.hpp>
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namespace boost { namespace hana { namespace detail { namespace operators {
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//! @ingroup group-details
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//! Enables [ADL](http://en.cppreference.com/w/cpp/language/adl) in the
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//! `hana::detail::operators` namespace.
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//!
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//! This is used by containers in Hana as a quick way to automatically
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//! define the operators associated to some concepts, in conjunction
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//! with the `detail::xxx_operators` family of metafunctions.
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//!
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//! Note that `adl` can be passed template arguments to make it unique
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//! amongst a set of derived classes. This allows a set of derived classes
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//! not to possess a common base class, which would disable the EBO when
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//! many of these derived classes are stored in a Hana container. If EBO
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//! is not a concern, `adl<>` can simply be used.
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template <typename ...>
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struct adl { };
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}} }} // end namespace boost::hana
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#endif // !BOOST_HANA_DETAIL_OPERATORS_ADL_HPP
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