Add basic closure example
This commit is contained in:
Timothy Warren
parent
a05a4eb790
commit
4015bdac47
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@ -21,6 +21,7 @@
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<cargoProject FILE="$PROJECT_DIR$/lifetimes/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/adder/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/minigrep/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/closures/Cargo.toml" />
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<unboundedVersionInspectionSettings>
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@ -82,8 +82,13 @@
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<sourceFolder url="file://$MODULE_DIR$/minigrep/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/minigrep/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/minigrep/benches" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/closures/src" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/closures/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/closures/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/closures/benches" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/adder/target" />
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<excludeFolder url="file://$MODULE_DIR$/branches/target" />
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<excludeFolder url="file://$MODULE_DIR$/closures/target" />
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<excludeFolder url="file://$MODULE_DIR$/ctof/target" />
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<excludeFolder url="file://$MODULE_DIR$/enums/target" />
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<excludeFolder url="file://$MODULE_DIR$/errors/target" />
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@ -13,30 +13,12 @@
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<leaf>
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<file pinned="false" current-in-tab="true">
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<entry file="file://$PROJECT_DIR$/minigrep/src/main.rs">
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<entry file="file://$PROJECT_DIR$/closures/src/main.rs">
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</file>
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<entry file="file://$PROJECT_DIR$/minigrep/src/lib.rs">
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</entry>
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</file>
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<file pinned="false" current-in-tab="false">
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<entry file="file://$PROJECT_DIR$/minigrep/poem.txt">
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</state>
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</provider>
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</entry>
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@ -53,9 +35,11 @@
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<component name="FindInProjectRecents">
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<findStrings>
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<find>ftoc</find>
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<find>expensive_closure(intensity)</find>
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</findStrings>
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<replaceStrings>
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<replace>f_to_c</replace>
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<replace>expensive_result.value(intensity)</replace>
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</replaceStrings>
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</component>
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<component name="Git.Settings">
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@ -97,6 +81,7 @@
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<option value="$PROJECT_DIR$/minigrep/poem.txt" />
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<option value="$PROJECT_DIR$/minigrep/src/lib.rs" />
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<option value="$PROJECT_DIR$/minigrep/src/main.rs" />
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<option value="$PROJECT_DIR$/closures/src/main.rs" />
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</list>
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</option>
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</component>
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@ -106,11 +91,11 @@
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<annotation-enable>false</annotation-enable>
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<other-services-enabled>false</other-services-enabled>
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<option name="height" value="876" />
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<option name="x" value="1920" />
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@ -127,22 +112,10 @@
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</path>
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="minigrep" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="minigrep" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="src" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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</expand>
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<select />
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</subPane>
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</pane>
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<pane id="PackagesPane" />
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<pane id="ProjectPane">
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<subPane>
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<expand>
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@ -165,11 +138,12 @@
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<select />
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</subPane>
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</pane>
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<pane id="PackagesPane" />
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</panes>
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</component>
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<component name="PropertiesComponent">
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<property name="JavaScriptWeakerCompletionTypeGuess" value="true" />
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<property name="js.eslint.eslintPackage" value="$USER_HOME$/.yarn-config/global/node_modules/.bin/eslint" />
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<property name="js.eslint.nodeInterpreter" value="project" />
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@ -183,7 +157,7 @@
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<property name="nodejs_npm_path_reset_for_default_project" value="true" />
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<property name="org.rust.cargo.project.model.PROJECT_DISCOVERY" value="true" />
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<property name="run.code.analysis.last.selected.profile" value="pProject Default" />
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<option name="ruleStates">
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@ -197,7 +171,7 @@
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</list>
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</option>
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</component>
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<component name="RunManager" selected="Cargo Command.Test lib::tests">
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<component name="RunManager" selected="Cargo Command.Run closures">
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<configuration name="<template>" type="TestNG" default="true" selected="false">
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<option name="MAIN_CLASS_NAME" />
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<option name="VM_PARAMETERS" value="-ea" />
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@ -216,13 +190,13 @@
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<option name="Make" enabled="true" />
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</method>
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</configuration>
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<configuration name="Run lifetimes" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<configuration name="Run closures" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package lifetimes --bin lifetimes" />
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<option name="command" value="run --package closures --bin closures" />
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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$/lifetimes" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/closures" />
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<envs />
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<method v="2" />
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</configuration>
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@ -275,11 +249,11 @@
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</configuration>
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<recent_temporary>
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<list>
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<item itemvalue="Cargo Command.Run closures" />
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<item itemvalue="Cargo Command.Test lib::tests" />
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<item itemvalue="Cargo Command.Test tests::greater_than_100" />
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<item itemvalue="Cargo Command.Test tests::greeting_contains_name" />
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<item itemvalue="Cargo Command.Test tests::it_works" />
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<item itemvalue="Cargo Command.Run lifetimes" />
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</list>
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</recent_temporary>
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</component>
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@ -304,11 +278,11 @@
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</history-entry>
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<frame x="1680" y="-410" width="1050" height="1657" extended-state="6" />
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<frame x="1920" y="-438" width="1080" height="1897" extended-state="6" />
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<editor active="true" />
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<layout>
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@ -316,7 +290,7 @@
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<window_info id="Cargo" order="6" sideWeight="0.49791494" weight="0.3286119" />
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@ -324,7 +298,7 @@
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@ -627,5 +601,12 @@
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</state>
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</provider>
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</entry>
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<entry file="file://$PROJECT_DIR$/closures/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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</entry>
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</component>
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</project>
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@ -0,0 +1,7 @@
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[package]
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name = "closures"
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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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@ -0,0 +1,71 @@
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use std::thread;
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use std::time::Duration;
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// @TODO: use a hashmap to memoize based on teh argument passed
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// @TODO: make more generic, to accept different types of arguments
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struct Cacher<T>
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where T: Fn(u32) -> u32
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{
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calculation: T,
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value: Option<u32>,
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}
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impl<T> Cacher<T>
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where T: Fn(u32) -> u32
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{
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fn new(calculation: T) -> Cacher<T> {
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Cacher {
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calculation,
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value: None,
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}
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}
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fn value(&mut self, arg: u32) -> u32 {
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match self.value {
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Some(v) => v,
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None => {
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let v = (self.calculation)(arg);
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self.value = Some(v);
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v
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},
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}
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}
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}
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fn generate_workout(intensity: u32, random_number: u32) {
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let mut expensive_result = Cacher::new(|num| {
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println!("calculating slowly...");
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thread::sleep(Duration::from_secs(2));
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num
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});
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if intensity < 25 {
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println!(
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"Today do {} pushups!",
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expensive_result.value(intensity)
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);
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println!(
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"Next, do {} situps!",
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expensive_result.value(intensity)
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);
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} else {
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if random_number == 3 {
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println!("Take a break today! Remember to stay hydrated!");
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} else {
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println!(
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"Today, run for {} minutes!",
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expensive_result.value(intensity)
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);
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}
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}
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}
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fn main() {
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let simulated_user_specified_value = 10;
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let simulated_random_number = 7;
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generate_workout(
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simulated_user_specified_value,
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simulated_random_number
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);
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}
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