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- // Copyright 2019 Peter Dimov.
- //
- // 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 <boost/mp11/utility.hpp>
- #include <boost/core/lightweight_test_trait.hpp>
- #include <cstddef>
- template<class T> using difference_type = typename T::difference_type;
- struct X
- {
- };
- struct Y
- {
- using difference_type = int;
- };
- int main()
- {
- using boost::mp11::mp_eval_or;
- using boost::mp11::mp_eval_or_q;
- using boost::mp11::mp_identity;
- using boost::mp11::mp_quote;
- BOOST_TEST_TRAIT_SAME(mp_eval_or<void, mp_identity>, void);
- BOOST_TEST_TRAIT_SAME(mp_eval_or<void, mp_identity, int>, mp_identity<int>);
- BOOST_TEST_TRAIT_SAME(mp_eval_or<void, mp_identity, int, int>, void);
- using Q_identity = mp_quote<mp_identity>;
- BOOST_TEST_TRAIT_SAME(mp_eval_or_q<void, Q_identity>, void);
- BOOST_TEST_TRAIT_SAME(mp_eval_or_q<void, Q_identity, int>, mp_identity<int>);
- BOOST_TEST_TRAIT_SAME(mp_eval_or_q<void, Q_identity, int, int>, void);
- BOOST_TEST_TRAIT_SAME(mp_eval_or<std::ptrdiff_t, difference_type, X>, std::ptrdiff_t);
- BOOST_TEST_TRAIT_SAME(mp_eval_or<std::ptrdiff_t, difference_type, Y>, int);
- using Q_diff_type = mp_quote<difference_type>;
- BOOST_TEST_TRAIT_SAME(mp_eval_or_q<std::ptrdiff_t, Q_diff_type, X>, std::ptrdiff_t);
- BOOST_TEST_TRAIT_SAME(mp_eval_or_q<std::ptrdiff_t, Q_diff_type, Y>, int);
- return boost::report_errors();
- }
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