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A method to help count enums. The switch statement will enforce you cover a state where you count. This is in response to this: https://github.com/jtbandes/swift-evolution/blob/case-enumerable/proposals/0000-derived-collection-of-enum-cases.md
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| enum Planets { | |
| case Mercury | |
| case Venus | |
| case Earth | |
| case Mars | |
| case Jupiter | |
| static let count: Int = _count() | |
| private static func _count(_ first: Planets = .Mercury) -> Int { | |
| print("blahp") | |
| var runningTotal = 0 | |
| switch first { | |
| case .Mercury: runningTotal += 1; fallthrough | |
| case .Venus: runningTotal += 1; fallthrough | |
| case .Earth: runningTotal += 1; fallthrough | |
| case .Mars: runningTotal += 1; fallthrough | |
| case .Jupiter: runningTotal += 1; //fallthrough | |
| } | |
| return runningTotal | |
| } | |
| static let count2: Int = _count2() | |
| private static func _count2(_ first: Planets = .Mercury) -> Int { | |
| print("pppp") | |
| switch first { | |
| case .Mercury: return 1 + _count2(.Venus) | |
| case .Venus: return 1 + _count2(.Earth) | |
| case .Earth: return 1 + _count2(.Mars) | |
| case .Mars: return 1 + _count2(.Jupiter) | |
| case .Jupiter: return 1 // + count2( | |
| } | |
| } | |
| } | |
| Planets.count // 5 | |
| Planets.count2 // 5 |
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