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Fixup app/tips

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Henrik Tjäder 2020-11-12 17:15:33 +00:00
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23
book/en/src/by-example/tips.md
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@ -2,15 +2,8 @@
## Generics
Resources may appear in contexts as resource proxies or as unique references
(`&mut-`) depending on the priority of the task. Because the same resource may
appear as *different* types in different contexts one cannot refactor a common
operation that uses resources into a plain function; however, such refactor is
possible using *generics*.
All resource proxies implement the `rtic::Mutex` trait. On the other hand,
unique references (`&mut-`) do *not* implement this trait (due to limitations in
the trait system) but one can wrap these references in the [`rtic::Exclusive`]
All resource proxies implement the `rtic::Mutex` trait.
If a resource does not implement this, one can wrap it in the [`rtic::Exclusive`]
newtype which does implement the `Mutex` trait. With the help of this newtype
one can write a generic function that operates on generic resources and call it
from different tasks to perform some operation on the same set of resources.
@ -27,15 +20,13 @@ $ cargo run --example generics
{{#include ../../../../ci/expected/generics.run}}
```
Using generics also lets you change the static priorities of tasks during
development without having to rewrite a bunch code every time.
## Conditional compilation
You can use conditional compilation (`#[cfg]`) on resources (the fields of
`struct Resources`) and tasks (the `fn` items). The effect of using `#[cfg]`
attributes is that the resource / task will *not* be available through the
corresponding `Context` `struct` if the condition doesn't hold.
`#[resources] struct Resources`) and tasks (the `fn` items).
The effect of using `#[cfg]` attributes is that the resource / task
will *not* be available through the corresponding `Context` `struct`
if the condition doesn't hold.
The example below logs a message whenever the `foo` task is spawned, but only if
the program has been compiled using the `dev` profile.
@ -132,7 +123,7 @@ You can inspect the file `rtic-expansion.rs` inside the `target` directory. This
file contains the expansion of the `#[rtic::app]` item (not your whole program!)
of the *last built* (via `cargo build` or `cargo check`) RTIC application. The
expanded code is not pretty printed by default so you'll want to run `rustfmt`
over it before you read it.
on it before you read it.
``` console
$ cargo build --example foo