[swift-users] @_transparent allowing a data member inside an enum inside MemoryLayout.swift

[Shyamal Chandra]

Hi,

After reading the Ray Wenderlich website tutorial [1] about Unsafe Swift, I
was checking out this file [3] inside swift/stdlib/public/core titled
MemoryLayout.swift.  However, I was confused about the @_transparent before
the each data member inside the enum.  Why is this enum with the data
members allowed by the Swift 3 language?  What does @_transparent allow you
to do that you might not otherwise?  Could someone explain because the
documentation is still unclear [2]?

Thanks!

Best,

Shyamal Chandra
shyamalc at gmail.com

Sources:

[1] https://www.raywenderlich.com/148569/unsafe-swift
[2] https://github.com/apple/swift/blob/master/docs/TransparentAttr.rst
[3]
https://github.com/apple/swift/blob/master/stdlib/public/core/MemoryLayout.swift
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