playing around with heapless
This commit is contained in:
commit
8a202160c0
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/target
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@ -0,0 +1,10 @@
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[package]
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name = "heapless-ecs"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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heapless = {version = "0.7.16", features = ["x86-sync-pool"]}
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@ -0,0 +1,63 @@
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#[macro_use]
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extern crate heapless;
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use core::mem::MaybeUninit;
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use heapless::{arc_pool, Arc};
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#[derive(Debug)]
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pub struct BigStruct {
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// <- does NOT implement Clone
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data: [u8; 128],
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// ..
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}
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pub enum SomeThings {
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smol(u8),
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lorge(BigStruct),
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}
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impl BigStruct {
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pub(crate) fn new() -> BigStruct {
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BigStruct { data: [0; 128] }
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}
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}
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// declare a memory pool
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arc_pool!(P: SomeThings);
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fn main() {
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static mut MEMORY: [u8; 1024] = [0; 1024];
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// give some static memory to the pool
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unsafe {
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P::grow(&mut MEMORY);
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}
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let x: Arc<P> = P::alloc(SomeThings::lorge(BigStruct::new()))
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.ok()
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.expect("OOM");
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let z: Arc<P> = P::alloc(SomeThings::smol(69)).ok().expect("OOM");
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// ^ NOTE: this is the Pool type, not the data type
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// cloning is cheap; it increases the refcount
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let y = x.clone();
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// same data address
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assert_eq!(&*x as *const _, &*y as *const _);
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for w in [&x, &y, &z] {
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match w.as_ref() {
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SomeThings::smol(x) => println!("smol {}", x),
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SomeThings::lorge(x) => println!("lorge {:?}", x),
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}
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}
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// decrease refcount
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drop(x);
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// refcount decreased to 0; memory is returned to the pool
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drop(y);
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// ..
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}
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