[ceph.git] / ceph / src / boost / libs / hana / include / boost / hana / detail / operators / adl.hpp

/*!
@file
Defines `boost::hana::detail::operators::adl`.

@copyright Louis Dionne 2013-2016
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
 */

#ifndef BOOST_HANA_DETAIL_OPERATORS_ADL_HPP
#define BOOST_HANA_DETAIL_OPERATORS_ADL_HPP

#include <boost/hana/config.hpp>


BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace operators {
    //! @ingroup group-details
    //! Enables [ADL](http://en.cppreference.com/w/cpp/language/adl) in the
    //! `hana::detail::operators` namespace.
    //!
    //! This is used by containers in Hana as a quick way to automatically
    //! define the operators associated to some concepts, in conjunction
    //! with the `detail::xxx_operators` family of metafunctions.
    //!
    //! Note that `adl` can be passed template arguments to make it unique
    //! amongst a set of derived classes. This allows a set of derived classes
    //! not to possess a common base class, which would disable the EBO when
    //! many of these derived classes are stored in a Hana container. If EBO
    //! is not a concern, `adl<>` can simply be used.
    template <typename ...>
    struct adl { };
}} BOOST_HANA_NAMESPACE_END

#endif // !BOOST_HANA_DETAIL_OPERATORS_ADL_HPP
Commit	Line	Data
7c673cae FG	1	/*!
	2	@file
	3	Defines `boost::hana::detail::operators::adl`.
	4
	5	@copyright Louis Dionne 2013-2016
	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)
	8	*/
	9
	10	#ifndef BOOST_HANA_DETAIL_OPERATORS_ADL_HPP
	11	#define BOOST_HANA_DETAIL_OPERATORS_ADL_HPP
	12
	13	#include <boost/hana/config.hpp>
	14
	15
	16	BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace operators {
	17	//! @ingroup group-details
	18	//! Enables [ADL](http://en.cppreference.com/w/cpp/language/adl) in the
	19	//! `hana::detail::operators` namespace.
	20	//!
	21	//! This is used by containers in Hana as a quick way to automatically
	22	//! define the operators associated to some concepts, in conjunction
	23	//! with the `detail::xxx_operators` family of metafunctions.
	24	//!
	25	//! Note that `adl` can be passed template arguments to make it unique
	26	//! amongst a set of derived classes. This allows a set of derived classes
	27	//! not to possess a common base class, which would disable the EBO when
	28	//! many of these derived classes are stored in a Hana container. If EBO
	29	//! is not a concern, `adl<>` can simply be used.
	30	template <typename ...>
	31	struct adl { };
	32	}} BOOST_HANA_NAMESPACE_END
	33
	34	#endif // !BOOST_HANA_DETAIL_OPERATORS_ADL_HPP