AtomicStruct<T> provides atomic ops on small trivial classes
Summary: AtomicStruct<T> acts like std::atomic<T>, but it supports any trivial or trivially-copyable type up to 8 bytes in size. I'm not sure why these types weren't included in the original std::atomic standard, since this construct removes a lot of boilerplate for some uses of std::atomic. Test Plan: 1. unit tests 2. this code is adapted from production use in tao/queues/LifoSem Reviewed By: davejwatson@fb.com FB internal diff: D1085106
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folly/AtomicStruct.h
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