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std::tuple_element<0, ::zeep::json::detail::iteration_proxy_value< IteratorType >>
// In header: <zeep/json/iterator.hpp> template<typename IteratorType> struct tuple_element<0, ::zeep::json::detail::iteration_proxy_value< IteratorType >> { // types typedef unspecified proxy_type; typedef decltype(std::declval< proxy_type >().key()) type; };