The State of Const Generics
summary
Rust stabilizes only a minimal subset of const generics in 2021 and nightly work now targets lifting its limits: defaulted const parameters stabilized 2021, integer/char/bool are currently the only allowed const types, and you cannot compute with const parameters yet. Explicit const-argument inference is implemented and nearly ready, generic const expressions remain a messy four-year unstable feature, and a smaller design called min generic const arguments (MGCA) — MVP in 1–2 PRs removes post-monomorphization panic classes.
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chapters (13)
- 0:00Introduction
- 1:06Const generics limitations 2021
- 2:32Defaulted const parameters
- 3:36Explicit inference for consts
- 5:03Custom types for consts
- 7:13Generic const expressions progress
- 9:22Min generic const arguments design
- 10:24Unsupported const features
- 13:36Future directions
- 14:18Q&A: standard library
- 16:24Q&A: generic const expressions
- 18:36Q&A: enum variants
- 20:00Closing remarks
