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add std::tuple_element and std::tuple_size specializations for index_value

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To make index_value work with structured bindings
https://wandbox.org/permlink/gsveiKdAamnEbOKM
This commit is contained in:
cekc
2019-02-25 18:35:53 +03:00
committed by GitHub
parent 9f94c8703b
commit 221ae46c2b
1 changed files with 25 additions and 0 deletions
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25
include/boost/range/adaptor/indexed.hpp
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@ -367,4 +367,29 @@ index(
} // namespace adaptors
} // namespace boost
#if !defined(BOOST_NO_CXX11_HDR_TUPLE)
namespace std {
#if defined(BOOST_CLANG)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wmismatched-tags"
#endif
template<size_t N, class T, class Indexable>
struct tuple_element<N, boost::range::index_value<T, Indexable>>:
boost::tuples::element<N, boost::range::index_value<T, Indexable>> {};
template<class T, class Indexable>
struct tuple_size<boost::range::index_value<T, Indexable>>:
std::integral_constant<std::size_t, 2> {};
#if defined(BOOST_CLANG)
#pragma clang diagnostic pop
#endif
} // namespace std
#endif // !defined(BOOST_NO_CXX11_HDR_TUPLE)
#endif // include guard