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- /*=============================================================================
- Copyright (c) 2019 Nikita Kniazev
- Use, modification and distribution is subject to 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 <boost/spirit/home/x3/support/unused.hpp>
- #include <type_traits>
- void test_use(boost::spirit::x3::unused_type) {}
- int main()
- {
- using boost::spirit::x3::unused;
- using boost::spirit::x3::unused_type;
- static_assert(std::is_trivial<unused_type>::value, "");
- unused_type unused_mut;
- static_assert(std::is_same<decltype((unused)), unused_type const&>::value, "");
- static_assert(std::is_same<decltype((unused_mut)), unused_type&>::value, "");
- static_assert(std::is_same<decltype(unused = 123), unused_type const&>::value, "");
- static_assert(std::is_same<decltype(unused = unused), unused_type const&>::value, "");
- static_assert(std::is_same<decltype(unused = unused_mut), unused_type const&>::value, "");
- static_assert(std::is_same<decltype(unused_mut = 123), unused_type&>::value, "");
- static_assert(std::is_same<decltype(unused_mut = unused), unused_type&>::value, "");
- static_assert(std::is_same<decltype(unused_mut = unused_mut), unused_type&>::value, "");
- test_use(0);
- test_use(unused);
- test_use(unused_mut);
- }
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