From 27ba908eb80ef1b6fbbe877eec0221300ef77f03 Mon Sep 17 00:00:00 2001 From: Lotte Steenbrink Date: Wed, 15 Jul 2020 15:16:38 +0200 Subject: [PATCH] radio-puzzle-help.md: add more hints to hapless constants --- embedded-workshop-book/src/radio-puzzle-help.md | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/embedded-workshop-book/src/radio-puzzle-help.md b/embedded-workshop-book/src/radio-puzzle-help.md index d4654ec..eba85a8 100644 --- a/embedded-workshop-book/src/radio-puzzle-help.md +++ b/embedded-workshop-book/src/radio-puzzle-help.md @@ -17,16 +17,18 @@ use heapless::consts::*; // defines U16, U32, U64... etc. to set the size of t fn main() { // A hash map with a capacity of 16 key-value pairs allocated on the stack + // note that U16 is a heapless constant, not Rust's u16 let mut my_map = FnvIndexMap::<_, _, U16>::new(); my_map.insert(b'A', b'~').unwrap(); // A vector with a fixed capacity of 8 elements allocated on the stack + // note that U8 is a heapless constant, not Rust's u8 let mut my_vec = Vec::<_, U8>::new(); my_vec.push(b'A').unwrap(); } ``` -If you haven't used a stack-allocated collection before note that you'll need to specify the capacity of the collection as a type parameter using one of the "type-level values" in the `heapless::consts` module. The [`heapless::IndexMap` documentation][indexMap] of the `heapless` crate has some usage examples, as does the [`heapless::Vec` documentation][vec]. +If you haven't used a stack-allocated collection before note that you'll need to specify the capacity of the collection as a type parameter using one of the "type-level values" in the `heapless::consts` module (e.g. `U8`, `U64` etc.). The [`heapless::IndexMap` documentation][indexMap] of the `heapless` crate has some usage examples, as does the [`heapless::Vec` documentation][vec]. [indexMap]: https://docs.rs/heapless/0.5.5/heapless/struct.IndexMap.html [vec]: https://docs.rs/heapless/0.5.5/heapless/struct.Vec.html