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-rw-r--r--3rdparty/asio/src/tests/properties/cpp03/can_prefer_member_prefer.cpp59
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diff --git a/3rdparty/asio/src/tests/properties/cpp03/can_prefer_member_prefer.cpp b/3rdparty/asio/src/tests/properties/cpp03/can_prefer_member_prefer.cpp
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index 00000000000..968e252aad5
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+++ b/3rdparty/asio/src/tests/properties/cpp03/can_prefer_member_prefer.cpp
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+//
+// cpp03/can_prefer_member_prefer.cpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include "asio/prefer.hpp"
+#include <cassert>
+
+template <int>
+struct prop
+{
+ static const bool is_preferable = true;
+};
+
+template <int>
+struct object
+{
+ template <int N>
+ object<N> prefer(prop<N>) const
+ {
+ return object<N>();
+ }
+};
+
+namespace asio {
+
+template<int N, int M>
+struct is_applicable_property<object<N>, prop<M> >
+{
+ static const bool value = true;
+};
+
+namespace traits {
+
+template<int N, int M>
+struct prefer_member<object<N>, prop<M> >
+{
+ static const bool is_valid = true;
+ static const bool is_noexcept = true;
+ typedef object<M> result_type;
+};
+
+} // namespace traits
+} // namespace asio
+
+int main()
+{
+ assert((asio::can_prefer<object<1>, prop<2> >::value));
+ assert((asio::can_prefer<object<1>, prop<2>, prop<3> >::value));
+ assert((asio::can_prefer<object<1>, prop<2>, prop<3>, prop<4> >::value));
+ assert((asio::can_prefer<const object<1>, prop<2> >::value));
+ assert((asio::can_prefer<const object<1>, prop<2>, prop<3> >::value));
+ assert((asio::can_prefer<const object<1>, prop<2>, prop<3>, prop<4> >::value));
+}