Hi Ed, > On May 19, 2017, at 10:10 AM, Edward Connell via swift-users > <swift-users@swift.org> wrote: > > I just switched to the 5/17 swift 4.0 tool chain on Linux, and I am getting > the following complaint when using swap on array elements. Is this warning > legitimate because of a copy on write issue? If so, is there some new swap > function for array elements? I realize I can turn 1 line into 3 and do the > swapping myself, it's just verbose. > > warning: simultaneous accesses to var 'dims', but modification requires > exclusive access; consider copying to a local variable > swap(&dims[lastIndex], &dims[lastIndex-1])
You can use the new swapAt() method: dims.swapAt(lastIndex, lastIndex-1) I recently added a Fix-It for this — but we really should also say "consider using ‘swapAt()’” in the diagnostic text as well in this case rather then mentioning copying to a local. Devin
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