57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
// Copyright 2017 Peter Dimov.
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// Distributed under the Boost Software License, Version 1.0.
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#include <boost/tuple/tuple.hpp>
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#include <boost/core/lightweight_test_trait.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/config.hpp>
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#include <boost/config/pragma_message.hpp>
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#if defined(BOOST_NO_CXX11_HDR_TUPLE)
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BOOST_PRAGMA_MESSAGE("Skipping std::tuple_element tests for lack of <tuple>")
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int main() {}
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#else
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#include <tuple>
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template<class Tp, std::size_t I, class E> void test()
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{
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BOOST_TEST_TRAIT_TRUE((boost::is_same<typename std::tuple_element<I, Tp>::type, E>));
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typedef typename Tp::inherited Tp2;
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BOOST_TEST_TRAIT_TRUE((boost::is_same<typename std::tuple_element<I, Tp2>::type, E>));
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}
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template<int> struct X
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{
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};
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int main()
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{
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test<boost::tuple<X<0> const>, 0, X<0> const>();
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test<boost::tuple<X<0> const, X<1> const>, 0, X<0> const>();
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test<boost::tuple<X<0> const, X<1> const>, 1, X<1> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const>, 0, X<0> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const>, 1, X<1> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const>, 2, X<2> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 0, X<0> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 1, X<1> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 2, X<2> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 3, X<3> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 0, X<0> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 1, X<1> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 2, X<2> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 3, X<3> const>();
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test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 4, X<4> const>();
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return boost::report_errors();
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}
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#endif
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