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Last active January 4, 2020 19:47
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Retroactive derivative registration in Swift (https://bugs.swift.org/browse/TF-866)
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README.md

Retroactive derivative registration: register derivatives for functions in other modules.

Previously:

  • If module A defines func foo, then its derivatives must be in the same module.

With retroactive derivative registration:

  • If module A defines func foo;
  • And if module B imports module A and defines @differentiating(foo) func derivativeFoo:
  • Then module C can import modules A and B and differentiate func foo (e.g. via differentiation APIs).
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