123456789101112131415161718192021222324252627282930313233343536373839404142434445 |
- /*=============================================================================
- 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/support/unused.hpp>
- #include <boost/static_assert.hpp>
- #include <boost/type_traits/is_same.hpp>
- #if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && \
- !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
- #include <type_traits>
- static_assert(std::is_trivial<boost::spirit::unused_type>::value, "");
- #endif
- void test_use(boost::spirit::unused_type) {}
- template <typename Expected, typename T>
- void test(T&)
- {
- BOOST_STATIC_ASSERT((boost::is_same<T&, Expected>::value));
- }
- int main()
- {
- using boost::spirit::unused;
- using boost::spirit::unused_type;
- unused_type unused_mut;
- test<unused_type const&>(unused);
- test<unused_type&>(unused_mut);
- test<unused_type const&>(unused = 123);
- test<unused_type const&>(unused = *&unused);
- test<unused_type const&>(unused = unused_mut);
- test<unused_type&>(unused_mut = 123);
- test<unused_type&>(unused_mut = unused);
- test<unused_type&>(unused_mut = *&unused_mut);
- test_use(0);
- test_use(unused);
- test_use(unused_mut);
- }
|