The (not so) hidden cost of sharing code between iOS and Android

on YouTube ↗33m

" summary

Dropbox abandons sharing business logic in C++ after years of operational cost: 85,000 lines of C++ (plus 35k open source and 10k build tooling), a homegrown Genie code generator, and C++ camera-roll sync and notification clients. Cross-language bugs produce ANR deadlocks and useless iOS stack traces, forcing changes to exception handling and heavy tooling. Migration strategy is design once, write twice: AB test components, rewrite into native Kotlin/Swift, and keep only isolated C++ black boxes like image processing.

AI-written summary · about

" chapters (12)

1. 0:00Introduction
2. 1:32Why we chose C++
3. 9:16History of C++ at Dropbox
4. 12:25Custom frameworks and tools
5. 17:24Why we stopped using C++
6. 18:29Four types of overhead
7. 25:10Training and hiring challenges
8. 25:32Sharing architecture instead
9. 28:19Migration process
10. 29:43When code sharing makes sense
11. 31:48Dropbox’s Rust use case
12. 32:08Q&A

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