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robliao authored
Per the C++ Style Guide: If you define an operator, also define any related operators that make sense, and make sure they are defined consistently. https://google.github.io/styleguide/cppguide.html#Operator_Overloading BUG= Review-Url: https://codereview.chromium.org/2702403014 Cr-Commit-Position: refs/heads/master@{#453137}
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