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Revert "Exercise: method and traits: change output" (#2548)

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Reverts google/comprehensive-rust#2383

Since #2397 is merged, to align the goal in #2478, rollback this temp
workaround.
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Alex Lai 2025-01-15 18:22:48 +08:00 committed by GitHub
parent 1c709efac0
commit aa548f4431
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2 changed files with 6 additions and 6 deletions
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2
src/methods-and-traits/exercise.md
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@ -9,7 +9,7 @@ method. Code which might log its progress can then take an `&impl Logger`. In
testing, this might put messages in the test logfile, while in a production
build it would send messages to a log server.
However, the `StdoutLogger` given below logs all messages, regardless of
However, the `StderrLogger` given below logs all messages, regardless of
verbosity. Your task is to write a `VerbosityFilter` type that will ignore
messages above a maximum verbosity.

10
src/methods-and-traits/exercise.rs
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@ -19,11 +19,11 @@ pub trait Logger {
fn log(&self, verbosity: u8, message: &str);
}
struct StdoutLogger;
struct StderrLogger;
impl Logger for StdoutLogger {
impl Logger for StderrLogger {
fn log(&self, verbosity: u8, message: &str) {
println!("verbosity={verbosity}: {message}");
eprintln!("verbosity={verbosity}: {message}");
}
}
// ANCHOR_END: setup
@ -31,7 +31,7 @@ impl Logger for StdoutLogger {
/// Only log messages up to the given verbosity level.
struct VerbosityFilter {
max_verbosity: u8,
inner: StdoutLogger,
inner: StderrLogger,
}
impl Logger for VerbosityFilter {
@ -44,7 +44,7 @@ impl Logger for VerbosityFilter {
// ANCHOR: main
fn main() {
let logger = VerbosityFilter { max_verbosity: 3, inner: StdoutLogger };
let logger = VerbosityFilter { max_verbosity: 3, inner: StderrLogger };
logger.log(5, "FYI");
logger.log(2, "Uhoh");
}