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-rw-r--r--3rdparty/asio/src/tests/properties/cpp11/require_concept_free.cpp52
1 files changed, 52 insertions, 0 deletions
diff --git a/3rdparty/asio/src/tests/properties/cpp11/require_concept_free.cpp b/3rdparty/asio/src/tests/properties/cpp11/require_concept_free.cpp
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index 00000000000..5179852e1ae
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+++ b/3rdparty/asio/src/tests/properties/cpp11/require_concept_free.cpp
@@ -0,0 +1,52 @@
+//
+// cpp11/require_concept_free.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/require_concept.hpp"
+#include <cassert>
+
+template <int>
+struct prop
+{
+ static constexpr bool is_requirable_concept = true;
+};
+
+template <int>
+struct object
+{
+ template <int N>
+ friend constexpr object<N> require_concept(const object&, prop<N>)
+ {
+ return object<N>();
+ }
+};
+
+namespace asio {
+
+template<int N, int M>
+struct is_applicable_property<object<N>, prop<M> >
+{
+ static constexpr bool value = true;
+};
+
+} // namespace asio
+
+int main()
+{
+ object<1> o1 = {};
+ object<2> o2 = asio::require_concept(o1, prop<2>());
+ (void)o2;
+
+ const object<1> o3 = {};
+ object<2> o4 = asio::require_concept(o3, prop<2>());
+ (void)o4;
+
+ constexpr object<2> o5 = asio::require_concept(object<1>(), prop<2>());
+ (void)o5;
+}