49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
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#ifndef BOOST_DESCRIBE_DESCRIPTOR_BY_POINTER_HPP_INCLUDED
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#define BOOST_DESCRIBE_DESCRIPTOR_BY_POINTER_HPP_INCLUDED
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// Copyright 2021 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/describe/detail/config.hpp>
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#if defined(__cpp_nontype_template_parameter_auto) && __cpp_nontype_template_parameter_auto >= 201606L
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#include <boost/mp11/algorithm.hpp>
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#include <boost/mp11/bind.hpp>
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#include <boost/mp11/integral.hpp>
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namespace boost
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{
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namespace describe
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{
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namespace detail
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{
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template<class Pm> constexpr bool cx_pmeq( Pm p1, Pm p2 )
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{
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return p1 == p2;
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}
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template<class Pm1, class Pm2> constexpr bool cx_pmeq( Pm1, Pm2 )
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{
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return false;
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}
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template<auto Pm> struct match_by_pointer
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{
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template<class D> using fn = mp11::mp_bool< cx_pmeq( D::pointer, Pm ) >;
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};
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} // namespace detail
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template<class L, auto Pm> using descriptor_by_pointer = mp11::mp_at<L, mp11::mp_find_if_q<L, detail::match_by_pointer<Pm>>>;
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} // namespace describe
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} // namespace boost
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#endif // __cpp_nontype_template_parameter_auto
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#endif // #ifndef BOOST_DESCRIBE_DESCRIPTOR_BY_POINTER_HPP_INCLUDED
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