数组扩展以按值删除对象
extension Array {
func removeObject<T where T : Equatable>(object: T) {
var index = find(self, object)
self.removeAtIndex(index)
}}var index = find(self, object)
不可转换为“T”
func removeObject(object: AnyObject)
‘AnyObject’不可转换为‘T’
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