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Make boost::tuple tuple-like to support structured bindings

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This commit is contained in:
Peter Dimov
2018-01-03 19:26:11 +02:00
parent c51d8a9495
commit 16731d2689
6 changed files with 247 additions and 10 deletions
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test/std_tuple_element.cpp Normal file
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// Copyright 2017 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
#include <boost/tuple/tuple.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/config.hpp>
#include <boost/config/pragma_message.hpp>
#if defined(BOOST_NO_CXX11_HDR_TUPLE)
BOOST_PRAGMA_MESSAGE("Skipping std::tuple_element tests for lack of <tuple>")
int main() {}
#else
#include <tuple>
template<class Tp, std::size_t I, class E> void test()
{
BOOST_TEST_TRAIT_TRUE((boost::is_same<typename std::tuple_element<I, Tp>::type, E>));
typedef typename Tp::inherited Tp2;
BOOST_TEST_TRAIT_TRUE((boost::is_same<typename std::tuple_element<I, Tp2>::type, E>));
}
template<int> struct X
{
};
int main()
{
test<boost::tuple<X<0> const>, 0, X<0> const>();
test<boost::tuple<X<0> const, X<1> const>, 0, X<0> const>();
test<boost::tuple<X<0> const, X<1> const>, 1, X<1> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const>, 0, X<0> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const>, 1, X<1> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const>, 2, X<2> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 0, X<0> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 1, X<1> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 2, X<2> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const>, 3, X<3> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 0, X<0> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 1, X<1> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 2, X<2> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 3, X<3> const>();
test<boost::tuple<X<0> const, X<1> const, X<2> const, X<3> const, X<4> const>, 4, X<4> const>();
return boost::report_errors();
}
#endif