类型方法
allocate(capacity:)
为指定数量的
Pointee
类型的实例分配未初始化的内存。声明
static func allocate(capacity count: Int) -> UnsafeMutablePointer<Pointee>
参数
count
要分配的内存量,在
Pointee
的实例中计数。
详述
结果指针引用绑定到Pointee
并且大小为count * MemoryLayout<Pointee>.stride
字节的内存区域。
以下示例分配了足够的新内存来存储四个 Int
实例,然后使用范围的元素初始化该内存。
let intPointer = UnsafeMutablePointer<Int>.allocate(capacity: 4)
for i in 0..<4 {
(intPointer + i).initialize(to: i)
}
print(intPointer.pointee)
// Prints "0"
分配内存时,请务必记住在完成后解除分配。
intPointer.deallocate()
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 UnsafeMutablePointer allocate(capacity:)。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。