48 lines
1.9 KiB
C++
48 lines
1.9 KiB
C++
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// Copyright 2017 Peter Dimov.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/mp11/utility.hpp>
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#include <boost/core/lightweight_test_trait.hpp>
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#include <type_traits>
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using boost::mp11::mp_eval_if;
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using boost::mp11::mp_eval_if_q;
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using boost::mp11::mp_identity_t;
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using boost::mp11::mp_valid;
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using boost::mp11::mp_quote;
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template<class C, class... A> using eval_if = mp_eval_if<C, void, mp_identity_t, A...>;
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int main()
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{
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BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type, void>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type, void, void>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::true_type, void, void, void>));
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BOOST_TEST_TRAIT_FALSE((mp_valid<eval_if, std::false_type>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<eval_if, std::false_type, void>));
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BOOST_TEST_TRAIT_FALSE((mp_valid<eval_if, std::false_type, void, void>));
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BOOST_TEST_TRAIT_FALSE((mp_valid<eval_if, std::false_type, void, void, void>));
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using Qi = mp_quote<mp_identity_t>;
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BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi, void>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi, void, void>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::true_type, void, Qi, void, void, void>));
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BOOST_TEST_TRAIT_FALSE((mp_valid<mp_eval_if_q, std::false_type, void, Qi>));
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BOOST_TEST_TRAIT_TRUE((mp_valid<mp_eval_if_q, std::false_type, void, Qi, void>));
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BOOST_TEST_TRAIT_FALSE((mp_valid<mp_eval_if_q, std::false_type, void, Qi, void, void>));
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BOOST_TEST_TRAIT_FALSE((mp_valid<mp_eval_if_q, std::false_type, void, Qi, void, void, void>));
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return boost::report_errors();
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}
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