swaitsandClaude Opus 4.6
3102fc747a
Implement full SSD1306 OLED display support: - Splash screen on boot (1.5s) with project name, version, board - Dashboard showing radio state, config, counters, RSSI/SNR - RSSI history sparkline (64-sample ring buffer, 2px-wide bars) - DisplayOn/DisplayOff host commands routed via dedicated channel - Pure render functions against generic DrawTarget (no hardware coupling) - Display on/off control bypasses radio task entirely Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
hashbrown
This crate is a Rust port of Google's high-performance SwissTable hash
map, adapted to make it a drop-in replacement for Rust's standard HashMap
and HashSet types.
The original C++ version of SwissTable can be found here, and this CppCon talk gives an overview of how the algorithm works.
Since Rust 1.36, this is now the HashMap implementation for the Rust standard
library. However you may still want to use this crate instead since it works
in environments without std, such as embedded systems and kernels.
Change log
Features
- Drop-in replacement for the standard library
HashMapandHashSettypes. - Uses foldhash as the default hasher, which is much faster than SipHash. However, foldhash does not provide the same level of HashDoS resistance as SipHash, so if that is important to you, you might want to consider using a different hasher.
- Around 2x faster than the previous standard library
HashMap. - Lower memory usage: only 1 byte of overhead per entry instead of 8.
- Compatible with
#[no_std](but requires a global allocator with thealloccrate). - Empty hash maps do not allocate any memory.
- SIMD lookups to scan multiple hash entries in parallel.
Usage
Add this to your Cargo.toml:
[dependencies]
hashbrown = "0.16"
Then:
use hashbrown::HashMap;
let mut map = HashMap::new();
map.insert(1, "one");
Flags
This crate has the following Cargo features:
nightly: Enables nightly-only features including:#[may_dangle].serde: Enables serde serialization support.rayon: Enables rayon parallel iterator support.equivalent: Allows comparisons to be customized with theEquivalenttrait. (enabled by default)raw-entry: Enables access to the deprecatedRawEntryAPI.inline-more: Adds inline hints to most functions, improving run-time performance at the cost of compilation time. (enabled by default)default-hasher: Compiles with foldhash as default hasher. (enabled by default)allocator-api2: Enables support for allocators that supportallocator-api2. (enabled by default)
License
Licensed under either of:
- Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)
at your option.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.