swift - 使用 Swift 5+ 将数据写入 OutputStream

Question

这段代码过去很好(从某种意义上说编译器没有提示):

extension OutputStream {
    func write(_ data: Data) -> Int {
        return data.withUnsafeBytes { pointer in
            return self.write(pointer, maxLength: data.count)
        }
    }
}

从 Swift 5.0 开始，这会产生警告:

Warning: 'withUnsafeBytes' is deprecated: use withUnsafeBytes<R>(_: (UnsafeRawBufferPointer) throws -> R) rethrows -> R instead

我尝试使用建议的方法，但似乎无法解决 UnsafeRawBufferPointer进入UnsafePointer<UInt8>那OutputStream.write最终需要。

如何以非弃用的方式编写此函数？

Answer 1

诀窍是使用 bindMemory 函数:

func write(_ data: Data) -> Int {
    return data.withUnsafeBytes({ (rawBufferPointer: UnsafeRawBufferPointer) -> Int in
        let bufferPointer = rawBufferPointer.bindMemory(to: UInt8.self)
        return self.write(bufferPointer.baseAddress!, maxLength: data.count)
    })
}

虽然这适用于 Swift 5.0，但显然存在一些问题；见 a related forum discussion .