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c++ Programming Glossary: data_it

Why does changing `const ull` to `const ull&` in function parameter result in performance gain?

http://stackoverflow.com/questions/14805641/why-does-changing-const-ull-to-const-ull-in-function-parameter-result-in-pe

rbegin std vector ull const_iterator rend for auto data_it cbegin data_it cend data_it if data_it 0 single_mult data rbegin.. std vector ull const_iterator rend for auto data_it cbegin data_it cend data_it if data_it 0 single_mult data rbegin rend data_it.. const_iterator rend for auto data_it cbegin data_it cend data_it if data_it 0 single_mult data rbegin rend data_it data The..