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Merge pull request #84 from cekc/patch-1

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add std::tuple_element and std::tuple_size specializations for index_value
This commit is contained in:
neilgroves
2020-05-11 19:05:06 +01:00
committed by GitHub
parent 5572b24a71 221ae46c2b
commit bb27d50b31
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