Method operator()

cpp/src/arrow/util/hashing.h:983–985

std::hash compatible hasher for use with std::unordered_ (the std::hash specialization provided by nonstd constructs std::string temporaries then invokes std::hash against those)

  // (the std::hash specialization provided by nonstd constructs std::string
  // temporaries then invokes std::hash<std::string> against those)
  hash_t operator()(std::string_view value) const {
    return ComputeStringHash<0>(value.data(), static_cast<int64_t>(value.size()));
  }
};

}  // namespace internal