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  1.  
  2. # API option 1
  4. # Assume this is implemented as a small bit of rpython
  5. # Returns a list object; almost always empty
  6. def get_queued_items():
  7. return [...]
  9. # App-level usage:
  10. items = get_queued_items()
  11. if items:
  12. # do something rare and expensive
  13. ...
  15. # API option 2
  17. # Assume these are both implemented as small bits of rpython
  18. def has_queued_items():
  19. return bool(...)
  21. def get_queued_items():
  22. return [...]
  24. # App-level usage:
  25. if has_queued_items():
  26. # do something rare and expensive
  27. items = get_queued_items()
  28. ...
  30. # Question: API option 2 naively seems a bit easier for the JIT to optimize, because it's "obvious"
  31. # that you don't need to allocate a list object etc. Is that true?
  32. #
  33. # Or is it trivial for the JIT to optimize option 1 into the same thing as it would do for
  34. # option 2?
  35.  
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