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⚛++
Combined from primary sources listed below.

In atomicint§

See primary documentation in context for postfix ⚛++. 

multi postfix:<⚛++>(atomicint $ is rw)

Performs an atomic increment on a native integer. This will be performed using hardware-provided atomic operations. Since the operation is atomic, it is safe to use without acquiring a lock. Returns the value as seen before incrementing it. Overflow will wrap around silently.