diff options
Diffstat (limited to '3rdparty/asio/src/tests/properties/cpp14/can_prefer_not_applicable_free_require.cpp')
-rw-r--r-- | 3rdparty/asio/src/tests/properties/cpp14/can_prefer_not_applicable_free_require.cpp | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/3rdparty/asio/src/tests/properties/cpp14/can_prefer_not_applicable_free_require.cpp b/3rdparty/asio/src/tests/properties/cpp14/can_prefer_not_applicable_free_require.cpp new file mode 100644 index 00000000000..e71bf759aa9 --- /dev/null +++ b/3rdparty/asio/src/tests/properties/cpp14/can_prefer_not_applicable_free_require.cpp @@ -0,0 +1,38 @@ +// +// cpp14/can_prefer_not_applicable_free_require.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 constexpr bool is_preferable = true; +}; + +template <int> +struct object +{ + template <int N> + friend constexpr object<N> require(const object&, prop<N>) + { + return object<N>(); + } +}; + +int main() +{ + static_assert(!asio::can_prefer_v<object<1>, prop<2>>, ""); + static_assert(!asio::can_prefer_v<object<1>, prop<2>, prop<3>>, ""); + static_assert(!asio::can_prefer_v<object<1>, prop<2>, prop<3>, prop<4>>, ""); + static_assert(!asio::can_prefer_v<const object<1>, prop<2>>, ""); + static_assert(!asio::can_prefer_v<const object<1>, prop<2>, prop<3>>, ""); + static_assert(!asio::can_prefer_v<const object<1>, prop<2>, prop<3>, prop<4>>, ""); +} |