How to deal with `withUnsafeBytes` is deprecated warning?

Question

I am getting deprecated warning for below code,

_ = data.withUnsafeBytes {
    _ = CC_SHA256($0, CC_LONG(data.count), &digest)
}

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

How can I deal with this?

Update

As suggested by Martin, I used below code for Swift-5,

func sha256(data : Data) -> Data {
    var hash = [UInt8](repeating: 0,  count: Int(CC_SHA256_DIGEST_LENGTH))
    data.withUnsafeBytes {
        _ = CC_SHA256($0.baseAddress, CC_LONG(data.count), &hash)
    }
    return Data(hash)
}

That's even giving comilers error,

Value of type 'UnsafePointer<_>' has no member 'baseAddress'

Update2

Martins solution works fine in Xcode 11.3.1. It does not work in Xcode 11 though.

The warning literally tells you which function you should use instead — mag_zbc, Mar 02 '20 at 08:59
I am not sure what `` means in the suggested signature, So I asked for help. @mag_zbc — Sazzad Hissain Khan, Mar 02 '20 at 09:00
Possibly helpful: https://stackoverflow.com/q/25388747/1187415 (with various Swift 5 solutions). — Martin R, Mar 02 '20 at 09:01
@MartinR, I am getting the compilers error `Value of type 'UnsafePointer<_>' has no member 'baseAddress'` as commented by Claus Jørgensen in your referred answer for Swift-5. — Sazzad Hissain Khan, Mar 02 '20 at 09:08
That is strange. I just double-checked that the code compiles with the current Xcode 11.3.1. Can you try it in a new fresh project? — Martin R, Mar 02 '20 at 09:12
@MartinR Your solution works perfectly in Xcode 11.3.1, I was trying with Xcode 11 before. Thanks a lot. — Sazzad Hissain Khan, Mar 02 '20 at 09:19

score 6 · Accepted Answer · answered Mar 03 '20 at 05:48

Martin's solutions worked fine for Xcode 11.3.1+,

func sha256(data : Data) -> Data {
    var hash = [UInt8](repeating: 0,  count: Int(CC_SHA256_DIGEST_LENGTH))
    data.withUnsafeBytes {
        _ = CC_SHA256($0.baseAddress, CC_LONG(data.count), &hash)
    }
    return Data(hash)
}

How to deal with `withUnsafeBytes` is deprecated warning?

Update

Update2

1 Answers1