Grokking Advanced Go
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The unsafe Package

The package unsafe comes with an unusual list of promises and non-promises, and it is worth reading them before any of its functions.

  • Promised: six patterns of use, listed in the documentation of unsafe.Pointer, are valid. Even those patterns, it says, "come with important caveats."
  • Not promised: code outside those patterns "is likely to be invalid today or to become invalid in the future."
  • Not promised: compatibility. The package documentation states that packages importing unsafe "may be non-portable and are not protected by the Go 1 compatibility guidelines."

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