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Fix build error in Xcode 13. #1

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Fix build error in Xcode 13. #1

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23 changes: 9 additions & 14 deletions Sources/HTTPManager.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1761,27 +1761,22 @@ public final class HTTPManagerMetricsCallback: NSObject {

// MARK: - Private

// Stored properties cannot be marked potentially unavailable with @unavailable.
// Therefore we will use a custom enum for this.
private enum MetricsCallbackWrapper {
case none
@available(iOS 10, macOS 10.12, tvOS 10, watchOS 3, *)
case some(HTTPManager.MetricsCallback)
// Wraps a `MetricsCallback` because stored properties cannot be marked potentially unavailable with @unavailable.
private struct MetricsCallbackWrapper {
static var none: MetricsCallbackWrapper { return MetricsCallbackWrapper() }

private var wrapped: Any?

@available(iOS 10, macOS 10.12, tvOS 10, watchOS 3, *)
init(_ metricsCallback: HTTPManager.MetricsCallback?) {
switch metricsCallback {
case .none: self = .none
case .some(let value): self = .some(value)
}
wrapped = metricsCallback
}

private init() {}

@available(iOS 10, macOS 10.12, tvOS 10, watchOS 3, *)
var asOptional: HTTPManager.MetricsCallback? {
switch self {
case .none: return .none
case .some(let value): return .some(value)
}
return wrapped as? HTTPManager.MetricsCallback
}
}

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