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Code Issues Releases Activity

Miscellaneous minor improvements (#2370)

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This commit is contained in:
Nicole L
2024-09-20 14:19:53 -07:00
committed by GitHub
parent aeb643f380
commit 2f9babd098
11 changed files with 57 additions and 37 deletions
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18
src/methods-and-traits/exercise.rs
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@ -14,25 +14,18 @@
// ANCHOR: solution
// ANCHOR: setup
use std::fmt::Display;
pub trait Logger {
/// Log a message at the given verbosity level.
fn log(&self, verbosity: u8, message: impl Display);
fn log(&self, verbosity: u8, message: &str);
}
struct StderrLogger;
impl Logger for StderrLogger {
fn log(&self, verbosity: u8, message: impl Display) {
fn log(&self, verbosity: u8, message: &str) {
eprintln!("verbosity={verbosity}: {message}");
}
}
fn do_things(logger: &impl Logger) {
logger.log(5, "FYI");
logger.log(2, "Uhoh");
}
// ANCHOR_END: setup
/// Only log messages up to the given verbosity level.
@ -42,7 +35,7 @@ struct VerbosityFilter {
}
impl Logger for VerbosityFilter {
fn log(&self, verbosity: u8, message: impl Display) {
fn log(&self, verbosity: u8, message: &str) {
if verbosity <= self.max_verbosity {
self.inner.log(verbosity, message);
}
@ -51,7 +44,8 @@ impl Logger for VerbosityFilter {
// ANCHOR: main
fn main() {
let l = VerbosityFilter { max_verbosity: 3, inner: StderrLogger };
do_things(&l);
let logger = VerbosityFilter { max_verbosity: 3, inner: StderrLogger };
logger.log(5, "FYI");
logger.log(2, "Uhoh");
}
// ANCHOR_END: main