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Update comments on heap availability on no_std.

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As per https://github.com/rust-embedded/book/issues/33.
This commit is contained in:
Jonathan 'theJPster' Pallant
2018-11-09 21:36:00 +00:00
parent 2add739249
commit 16c8d1f44d
1 changed files with 8 additions and 1 deletions
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src/intro/no-std.md
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@@ -44,13 +44,20 @@ bootstrapping (stage 0) code like bootloaders, firmware or kernels.
| feature | no\_std | std |
|-----------------------------------------------------------|--------|-----|
| heap (dynamic memory) | ✘ | ✓ |
| heap (dynamic memory) | * | ✓ |
| collections (Vec, HashMap, etc) | ** | ✓ |
| stack overflow protection | ✘ | ✓ |
| runs init code before main | ✘ | ✓ |
| libstd available | ✘ | ✓ |
| libcore available | ✓ | ✓ |
| writing firmware, kernel, or bootloader code | ✓ | ✘ |
\* Only if you use the `alloc` crate and use a suitable allocator like [alloc-cortex-m].
\** Only if you use the `collections` crate and configure a global default allocator.
[alloc-cortex-m]: https://github.com/rust-embedded/alloc-cortex-m
## See Also
* [FAQ](https://www.rust-lang.org/en-US/faq.html#does-rust-work-without-the-standard-library)
* [RFC-1184](https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md)