Emcee

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import Foundation
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enum FileState {
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    case open(FileHandle)
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    case closed
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    var openedFileHandle: FileHandle? {
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        switch self {
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        case .open(let handle): return handle
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        case .closed: return nil
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        }
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    }
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    mutating func close() {
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        switch self {
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        case .open(let handle):
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            handle.closeFile()
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            self = .closed
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        case .closed:
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            break
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        }
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    }
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}
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