Crate features / ff
Feature flags · ff 0.14.0 · from crates.io 2026-10-24
ff features: what each one does, and the line to copy
Short answerff 0.14.0 has 4 features. By default it turns on bits, std; add default-features = false to start from nothing. It needs Rust 1.85 or newer.
Pick features
Every feature
| Feature | In default | Turns on |
|---|---|---|
alloc | nothing else (a switch the code checks) | |
bits | yes | bitvec, ff_derive?/bits |
derive | byteorder, ff_derive | |
std | yes | alloc |
dep:x turns on the optional dependency x; x/y turns on feature y of dependency x (with ?, only if x is already on).
MSRV history
The minimum Rust version ff declares (rust-version), and the release that changed it:
- 0.13.1 (2025-03-09): Rust 1.56
- 0.14.0-pre.0 (2025-04-17): Rust 1.63
- 0.14.0-pre.1 (2026-05-21): Rust 1.85
Stuck on an older compiler? Pin the last version that supports it, for example cargo update -p ff --precise <version>, or use resolver 3, which picks compatible versions for you.
More on ff
Real downloads, dependents and alternatives: ff crate data (863.5K real downloads a day, 293 dependents).
docs.rs feature list · crates.io · license MIT/Apache-2.0 · edition 2021
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