類型方法
allocate(capacity:)
為指定數量的
Element
類型的實例分配未初始化的內存。聲明
static func allocate(capacity count: Int) -> UnsafeMutableBufferPointer<Element>
參數
count
要分配的內存量,在
Element
的實例中計數。
詳述
生成的緩衝區引用綁定到Element
並且大小為count * MemoryLayout<Element>.stride
字節的內存區域。
下麵的示例分配一個可以存儲四個 Int
實例的緩衝區,然後使用範圍的元素初始化該內存:
let buffer = UnsafeMutableBufferPointer<Int>.allocate(capacity: 4)
_ = buffer.initialize(from: 1...4)
print(buffer[2])
// Prints "3"
分配內存時,請務必記住在完成後解除分配。
buffer.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:本文由純淨天空篩選整理自apple.com大神的英文原創作品 UnsafeMutableBufferPointer allocate(capacity:)。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。