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Add new const_unique_new feature gate (#355)

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Philipp Oppermann
2017-10-03 13:29:22 +02:00
committed by GitHub
parent 82c4a6f0a0
commit b58ee1e52b
2 changed files with 4 additions and 1 deletions
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4
blog/content/posts/04-printing-to-screen/index.md
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@@ -253,7 +253,9 @@ pub fn print_something() {
writer.write_byte(b'H');
}
```
It just creates a new Writer that points to the VGA buffer at `0xb8000`. Then it writes the byte `b'H'` to it. The `b` prefix creates a [byte character], which represents an ASCII code point. When we call `vga_buffer::print_something` in main, a `H` should be printed in the _lower_ left corner of the screen in light green:
It just creates a new Writer that points to the VGA buffer at `0xb8000`. To use the unstable `Unique::new_unchecked` function, we need to add the feature flag `#![feature(const_unique_new)]` to the top of our `src/lib.rs`.
Then it writes the byte `b'H'` to it. The `b` prefix creates a [byte character], which represents an ASCII code point. When we call `vga_buffer::print_something` in main, a `H` should be printed in the _lower_ left corner of the screen in light green:
[byte character]: https://doc.rust-lang.org/reference.html#characters-and-strings