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book: update cross platform code samples

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Our original code sample was missing some elements in the use statements
that clarified how modules were organized with sys.

BUG=none
TEST=n/a

Change-Id: I62d6a294218fa7c9c5853dbefc6550de763e7c8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3614852
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
Reviewed-by: Vikram Auradkar <auradkar@google.com>
This commit is contained in:
Noah Gold 2022-04-28 13:26:56 -07:00 committed by Chromeos LUCI
parent 55a5b54bf2
commit fdd42b7b0e
1 changed files with 8 additions and 6 deletions
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14
docs/book/src/contributing/style_guide_platform_specific_code.md
View file

@ -396,12 +396,14 @@ File: `sys.rs`
cfg_if::cfg_if! {
if #[cfg(unix)] {
pub mod unix;
pub use self::unix::print_hello;
use unix as platform;
} else if #[cfg(windows)] {
pub mod windows;
pub use self::windows::print_hello;
use windows as platform;
}
}
pub use platform::print;
```
File: `unix.rs`
@ -434,16 +436,16 @@ The user of the library, say mylib, now has to do something like below which mak
the functions `print_u8` and `print_u16` are platform specific.
```rust
use mylib::print_hello;
use mylib::sys::print;
fn my_print() {
print_hello();
print();
#[cfg(unix)]
mylib::unix::print_u8(1);
mylib::sys::unix::print_u8(1);
#[cfg(windows)]
mylib::windows::print_u16(1);
mylib::sys::windows::print_u16(1);
}
```