]>
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2 // cpp03/can_prefer_not_preferable_member_prefer.cpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
11 #include <boost/asio/prefer.hpp>
17 static const bool is_preferable
= false;
24 object
<N
> prefer(prop
<N
>) const
33 template<int N
, int M
>
34 struct is_applicable_property
<object
<N
>, prop
<M
> >
36 static const bool value
= true;
41 template<int N
, int M
>
42 struct prefer_member
<object
<N
>, prop
<M
> >
44 static const bool is_valid
= true;
45 static const bool is_noexcept
= true;
46 typedef object
<M
> result_type
;
55 assert((!boost::asio::can_prefer
<object
<1>, prop
<2> >::value
));
56 assert((!boost::asio::can_prefer
<object
<1>, prop
<2>, prop
<3> >::value
));
57 assert((!boost::asio::can_prefer
<object
<1>, prop
<2>, prop
<3>, prop
<4> >::value
));
58 assert((!boost::asio::can_prefer
<const object
<1>, prop
<2> >::value
));
59 assert((!boost::asio::can_prefer
<const object
<1>, prop
<2>, prop
<3> >::value
));
60 assert((!boost::asio::can_prefer
<const object
<1>, prop
<2>, prop
<3>, prop
<4> >::value
));