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common/thread: Make Barrier's 'count' member non-const
While admirable as a means to ensure immutability, this has the unfortunate downside of making the class non-movable. std::move cannot actually perform a move operation if the provided operand has const data members (std::move acts as an operation to "slide" resources out of an object instance). Given Barrier contains move-only types such as std::mutex, this can lead to confusing error messages if an object ever contained a Barrier instance and said object was attempted to be moved.
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@ -82,7 +82,7 @@ public:
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private:
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std::condition_variable condvar;
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std::mutex mutex;
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const std::size_t count;
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std::size_t count;
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std::size_t waiting = 0;
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std::size_t generation = 0; // Incremented once each time the barrier is used
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};
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