Converting *byte to unsafe.Pointer and back to *byte

[dmitry....@jetbrains.com]

What is the meaning of the conversion

    var b []byte

    var p *byte = (*byte)(unsafe.Pointer(*b[0]))

It is used for example in https://github.com/golang/net/blob/master/internal/socket/iovec_64bit.go.

How it is different from

    var b []byte

    var p *byte = &b[0]

Thank you!

[Keith Randall]

On Tuesday, February 25, 2020 at 4:10:46 AM UTC-8 dmitry....@jetbrains.com wrote:

What is the meaning of the conversion

    var b []byte

    var p *byte = (*byte)(unsafe.Pointer(*b[0]))

You mean &b[0] at the end there, not *b[0].

 

It is used for example in https://github.com/golang/net/blob/master/internal/socket/iovec_64bit.go.

How it is different from

    var b []byte

    var p *byte = &b[0]

It is not any different. Not sure why the code goes through that hoop unnecessarily.

Probably historical accident. Maybe go through the change history and see how it evolved.

 

Thank you!

[robert engels]

Maybe an artifact of the C to Go automatic translation tool.

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