Add interior_mutability example
This commit is contained in:
Timothy Warren
parent
9347fea052
commit
fcd4ecceb1
1
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generated
1
.idea/misc.xml
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@ -26,6 +26,7 @@
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<cargoProject FILE="$PROJECT_DIR$/add/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/reference_counting/Cargo.toml" />
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5
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5
.idea/rust.iml
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@ -106,6 +106,10 @@
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@ -118,6 +122,7 @@
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71
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71
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@ -5,6 +5,7 @@
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@ -92,6 +106,7 @@
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@ -165,7 +180,7 @@
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@ -232,16 +247,6 @@
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<envs />
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<option name="channel" value="DEFAULT" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/closures" />
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Test lib::tests (1)" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="test --package minigrep_v2 --lib tests" />
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@ -252,13 +257,23 @@
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Test using_other_iterator_trait_methods" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<configuration name="Test lib::tests" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="test --package closures --lib using_other_iterator_trait_methods -- --exact" />
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<option name="command" value="test --package interior_mutability --lib tests" />
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<option name="allFeatures" value="false" />
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<option name="nocapture" value="false" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/closures" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/interior_mutability" />
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<envs />
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</configuration>
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<option name="channel" value="DEFAULT" />
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<option name="command" value="test --package interior_mutability --lib tests::it_sends_an_over_75_percent_warning_message -- --exact" />
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<option name="allFeatures" value="false" />
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<option name="nocapture" value="false" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/interior_mutability" />
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<envs />
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<method v="2" />
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</configuration>
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@ -272,10 +287,10 @@
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<recent_temporary>
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<list>
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<item itemvalue="Cargo Command.Run reference_counting" />
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<item itemvalue="Cargo Command.Test lib::tests" />
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<item itemvalue="Cargo Command.Test tests::it_sends_an_over_75_percent_warning_message" />
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<item itemvalue="Cargo Command.Run smart_pointers" />
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<item itemvalue="Cargo Command.Test lib::tests (1)" />
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<item itemvalue="Cargo Command.Test using_other_iterator_trait_methods" />
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<item itemvalue="Cargo Command.Test calling_next_directly" />
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@ -307,6 +322,9 @@
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<history-entry file="Test_using_other_iterator_trait_methods - 2019.02.01 at 16h 05m 11s.xml">
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<configuration name="Test using_other_iterator_trait_methods" configurationId="CargoCommandRunConfiguration" />
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</history-entry>
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<history-entry file="Test_lib__tests - 2019.02.05 at 10h 33m 57s.xml">
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<configuration name="Test lib::tests" configurationId="CargoCommandRunConfiguration" />
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@ -731,10 +749,21 @@
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7
interior_mutability/Cargo.toml
Normal file
7
interior_mutability/Cargo.toml
Normal file
@ -0,0 +1,7 @@
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[package]
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name = "interior_mutability"
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version = "0.1.0"
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authors = ["Timothy Warren <twarren@nabancard.com>"]
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edition = "2018"
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[dependencies]
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70
interior_mutability/src/lib.rs
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70
interior_mutability/src/lib.rs
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@ -0,0 +1,70 @@
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pub trait Messenger {
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fn send(&self, msg: &str);
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}
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pub struct LimitTracker<'a, T: 'a + Messenger> {
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messenger: &'a T,
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value: usize,
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max: usize,
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}
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impl<'a, T> LimitTracker<'a, T>
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where T: Messenger {
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pub fn new(messenger: &T, max: usize) -> LimitTracker<T> {
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LimitTracker {
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messenger,
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value: 0,
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max,
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}
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}
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pub fn set_value(&mut self, value: usize) {
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self.value = value;
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let percentage_of_max = self.value as f64 / self.max as f64;
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if percentage_of_max >=1.0 {
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self.messenger.send("Error: You are over your quota!");
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} else if percentage_of_max >= 0.9 {
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self.messenger.send("Urgent warning: You've used up over 90% of your quota!");
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} else if percentage_of_max >= 0.75 {
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self.messenger.send("Warning: You've used up over 75% of your quota!");
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::cell::RefCell;
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struct MockMessenger {
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// RefCell wraps the vector in a way that it can be mutably
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// referenced at runtime
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sent_messages: RefCell<Vec<String>>,
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}
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impl MockMessenger {
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fn new() -> MockMessenger {
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MockMessenger { sent_messages: RefCell::new(vec![]) }
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}
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}
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impl Messenger for MockMessenger {
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fn send(&self, message: &str) {
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// If we tried to create another mutable borrow in this scope,
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// it would cause a panic. Same rules as at compile time.
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self.sent_messages.borrow_mut().push(String::from(message));
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}
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}
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#[test]
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fn it_sends_an_over_75_percent_warning_message() {
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let mock_messenger = MockMessenger::new();
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let mut limit_tracker = LimitTracker::new(&mock_messenger, 100);
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limit_tracker.set_value(80);
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assert_eq!(mock_messenger.sent_messages.borrow().len(), 1);
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}
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}
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