操作符
==(_:
==(_:_:)
返回一个布尔值,指示两个 type-erased 可散列实例是否包装相同的值。
声明
static func == (lhs: AnyHashable, rhs: AnyHashable) -> Bool
参数
lhs
type-erased 可散列值。
rhs
另一个 type-erased 可哈希值。
详述
当 type-erased 时,AnyHashable
认为相同值的桥接对应项(例如 String
和 NSString
)是等效的。如果这些兼容类型对相等使用不同的定义,则最初不同的值在转换为 AnyHashable
时可能会比较为相等:
let string1 = "café"
let string2 = "cafe\u{301}" // U+301 COMBINING ACUTE ACCENT
let nsString1 = string1 as NSString
let nsString2 = string2 as NSString
let typeErased1 = nsString1 as AnyHashable
let typeErased2 = nsString2 as AnyHashable
print(string1 == string2) // prints "true"
print(nsString1 == nsString2) // prints "false"
print(typeErased1 == typeErased2) // prints "true"
可用版本
iOS 8.0+, iPadOS 8.0+, macOS 10.10+, Mac Catalyst 13.0+, tvOS 9.0+, watchOS 2.0+
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注:本文由纯净天空筛选整理自apple.com大神的英文原创作品 AnyHashable ==(_:_:)。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。