实例属性
indices
对集合下标有效的索引,按升序排列。
声明
var indices: UnsafeMutableBufferPointer<Element>.Indices { get }
详述
集合的indices
属性可以持有对集合本身的强引用,从而导致集合被非唯一引用。如果在迭代集合的索引时改变集合,强引用可能会导致集合的意外副本。为避免意外复制,请改用以 startIndex
开头的 index(after:)
方法来生成索引。
var c = MyFancyCollection([10, 20, 30, 40, 50])
var i = c.startIndex
while i != c.endIndex {
c[i] /= 5
i = c.index(after: i)
}
// c == MyFancyCollection([2, 4, 6, 8, 10])
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 UnsafeMutableBufferPointer indices。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。