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boost::pfr::get — Returns reference or const reference to a field with index I in simple aggregate val. Overload taking the type U returns reference or const reference to a field with provided type U in simple aggregate val if there's only one field of such type in val.
// In header: <boost/pfr/core.hpp> template<std::size_t I, typename T> constexpr decltype(auto) get(const T & val);