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由 jsteemann 提交于
Summary: this avoids a few copies of std::string and other structs in the context of range-based for loops. instead of copying the values for each iteration, use a const reference to avoid copying. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4459 Differential Revision: D10282045 Pulled By: sagar0 fbshipit-source-id: 5012e910dca279abd2be847e1fb432d96274edfb
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