swift泛型

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/// 交换两个对象的值
///
/// - Parameters:
///   - aValue: 对象a
///   - bValue: 对象b
func swapValues<T>(_ aValue: inout T, _ bValue: inout T) {
    let temp = aValue
    aValue = bValue
    bValue = temp
}

/// 栈模板
struct QStack<T> {
    
    var items = [T]()
    mutating func push(_ item: T) {
        items.append(item)
    }
    
    mutating func pop() -> T {
        return self.items.removeLast()
    }
    
    func isEmpty() -> Bool {
       return (0 == self.items.count)
    }
    
    var count: Int {
        return self.items.count
    }
    
    subscript(i: Int) -> T {
        return self.items[i]
    }
}