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I don't find it from google. How can Iparallel_reduce either the key or value of a map? For example:
map<T, size_t> counts;size_t count = parallel_reduce(blocked_range<pair<T, size_t>>(0, counts.size()), 0,[&](tbb::blocked_range<pair<T, size_t>> const &r, size_t running_total){for (auto it = r.begin(); it != r.end(); it++)running_total += it->second;return running_total;},std::plus<pair<T, size_t>>());