CopyOnWriteSupport
用于深度延迟复制的容器
用法
let shadowInteger: ShadowValue<Int> = ShadowValue(7)
var copied = shadowInteger // shallow-copy
copied.value = 42 // deep-copy
用于深度延迟复制的容器
let shadowInteger: ShadowValue<Int> = ShadowValue(7)
var copied = shadowInteger // shallow-copy
copied.value = 42 // deep-copy