The document discusses Foreign Function Interface (FFI) libraries for Ruby. It mentions the ffi gem which provides a FFI for Ruby and allows easy integration of Ruby with external libraries written in other languages like C. It also discusses PyCall which uses ffi to provide a way to call Python code from Ruby. Some example uses of FFI libraries are to call fast Fourier transform (FFT) code or integrate with C libraries for tasks like image processing.

1. FFI
2017/06/25(Wed) Shinjuku.rb #51
@treby006

2. self.introduction
• Hiroaki Ninomiya a.k.a treby
• Frontend Engineer at Repro
• ( )
• Shinjuku.rb
• IM@Study ( ) /
•

3. We’re hiring!!
• Repro
•
(SRE )

4. • FFI
• FFI
• PyCall
• PyCall

5. FFI
• Foreign Function Interface
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6. FFI
• Foreign Function Interface
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• ( )

7. FFI
• Foreign Function Interface
•
• ( )
• Fast Fourier Transform / FFT

8. • ` FFI

9. FFI
• https://github.com/ffi/ffi/wiki/Why-use-FFI
• An FFI extension is easy to read
• An FFI extension is easy to write

10. FFI
• https://github.com/ffi/ffi/wiki/Why-use-FFI
• An FFI extension is easy to read
•
• An FFI extension is easy to write
•

11. FFI
• https://github.com/ffi/ffi/wiki/Why-use-FFI
• An FFI extension is easy to read
•
• An FFI extension is easy to write
•
• 😇

12. • FFI
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PHP Rails ( )
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•
• ( )
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13. PyCall Readme

14. PyCall
• https://github.com/mrkn/pycall/blob/
d591a2a26319e5a34e38dd35d13a8410c9c585b2/lib/
pycall/import.rb#L16-L28
• https://github.com/mrkn/pycall/blob/
3e03c7bd4b84a8a6e7f1746de889d27022001fa5/lib/
pycall/eval.rb#L39-L51
• https://github.com/mrkn/pycall/blob/
6398d2acbecaca21e69ac48c84535ce26f098bfc/lib/
pycall/libpython.rb#L351

15. ffi/ffi
• https://github.com/ffi/ffi
• Ruby FFI
• PyCall

16. • PyCall
• ffi/ffi Gem
• lib-ffi