Add reference_cycles example
This commit is contained in:
Timothy Warren
parent
fcd4ecceb1
commit
971140b6ff
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@ -27,6 +27,7 @@
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<cargoProject FILE="$PROJECT_DIR$/smart_pointers/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/reference_counting/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/interior_mutability/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/reference_cycles/Cargo.toml" />
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</component>
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<component name="ComposerJsonPluginSettings">
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<unboundedVersionInspectionSettings>
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@ -110,6 +110,10 @@
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<sourceFolder url="file://$MODULE_DIR$/interior_mutability/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/interior_mutability/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/interior_mutability/benches" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/reference_cycles/src" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/reference_cycles/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/reference_cycles/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/reference_cycles/benches" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/add/add-one/target" />
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<excludeFolder url="file://$MODULE_DIR$/add/adder/target" />
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<excludeFolder url="file://$MODULE_DIR$/adder/target" />
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@ -130,6 +134,7 @@
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<excludeFolder url="file://$MODULE_DIR$/modules/target" />
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<excludeFolder url="file://$MODULE_DIR$/rectangles/target" />
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<excludeFolder url="file://$MODULE_DIR$/reference_counting/target" />
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<excludeFolder url="file://$MODULE_DIR$/reference_cycles/target" />
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<excludeFolder url="file://$MODULE_DIR$/references/target" />
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<excludeFolder url="file://$MODULE_DIR$/scope/target" />
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<excludeFolder url="file://$MODULE_DIR$/slices/target" />
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@ -5,7 +5,6 @@
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<change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/misc.xml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/.idea/rust.iml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/rust.iml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/reference_counting/src/main.rs" beforeDir="false" afterPath="$PROJECT_DIR$/reference_counting/src/main.rs" afterDir="false" />
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</list>
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<option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
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<option name="SHOW_DIALOG" value="false" />
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@ -15,24 +14,11 @@
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</component>
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<component name="FileEditorManager">
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<leaf>
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<file pinned="false" current-in-tab="false">
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<entry file="file://$PROJECT_DIR$/interior_mutability/src/lib.rs">
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</provider>
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</entry>
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</file>
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<file pinned="false" current-in-tab="true">
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<entry file="file://$PROJECT_DIR$/reference_counting/src/main.rs">
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<entry file="file://$PROJECT_DIR$/reference_cycles/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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</entry>
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@ -108,6 +94,7 @@
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<option value="$PROJECT_DIR$/smart_pointers/src/main.rs" />
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<option value="$PROJECT_DIR$/interior_mutability/src/lib.rs" />
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<option value="$PROJECT_DIR$/reference_counting/src/main.rs" />
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<option value="$PROJECT_DIR$/reference_cycles/src/main.rs" />
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</list>
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</option>
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</component>
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@ -141,12 +128,12 @@
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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="reference_counting" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="reference_cycles" type="9f88c78c:ScopeViewTreeModel$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="reference_counting" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="reference_cycles" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="src" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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</expand>
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@ -180,7 +167,7 @@
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</component>
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<component name="PropertiesComponent">
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<property name="JavaScriptWeakerCompletionTypeGuess" value="true" />
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<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1549381304560" />
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<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1549383008644" />
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<property name="javascript.nodejs.core.library.configured.version" value="7.1.0" />
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<property name="js.eslint.eslintPackage" value="$USER_HOME$/.yarn-config/global/node_modules/.bin/eslint" />
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<property name="js.eslint.nodeInterpreter" value="project" />
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@ -208,7 +195,7 @@
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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.Run reference_counting">
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<component name="RunManager" selected="Cargo Command.Run reference_cycles">
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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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@ -237,6 +224,16 @@
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run reference_cycles" 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 reference_cycles --bin reference_cycles" />
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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$/reference_cycles" />
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run smart_pointers" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package smart_pointers --bin smart_pointers" />
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@ -247,16 +244,6 @@
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Test lib::tests (1)" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="test --package minigrep_v2 --lib tests" />
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<option name="allFeatures" value="false" />
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<option name="nocapture" value="false" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/minigrep_v2" />
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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" 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 interior_mutability --lib tests" />
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@ -286,11 +273,11 @@
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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 reference_cycles" />
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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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</list>
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</recent_temporary>
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</component>
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@ -330,8 +317,8 @@
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<editor active="true" />
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<window_info content_ui="combo" id="Project" order="0" sideWeight="0.49644932" visible="true" weight="0.26141885" />
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@ -339,7 +326,7 @@
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<window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
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@ -749,9 +736,16 @@
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</state>
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</provider>
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</entry>
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<entry file="file://$PROJECT_DIR$/reference_counting/src/main.rs">
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</entry>
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<entry file="file://$PROJECT_DIR$/interior_mutability/src/lib.rs">
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<provider selected="true" editor-type-id="text-editor">
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<element signature="e#1104#1105#0" expanded="true" />
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@ -760,10 +754,10 @@
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</state>
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</provider>
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</entry>
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<entry file="file://$PROJECT_DIR$/reference_counting/src/main.rs">
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<entry file="file://$PROJECT_DIR$/reference_cycles/src/main.rs">
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@ -0,0 +1,7 @@
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[package]
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name = "reference_cycles"
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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 +1,98 @@
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use std::rc::{Rc, Weak};
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use std::cell::RefCell;
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use List::{Cons, Nil};
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#[derive(Debug)]
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enum List {
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Cons(i32, RefCell<Rc<List>>),
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Nil,
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}
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impl List {
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fn tail(&self) -> Option<&RefCell<Rc<List>>> {
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match self {
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Cons(_, item) => Some(item),
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Nil => None,
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}
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}
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}
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fn cycle_example() {
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let a = Rc::new(Cons(5, RefCell::new(Rc::new(Nil))));
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println!("a initial rc count = {}", Rc::strong_count(&a));
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println!("a next item = {:?}", a.tail());
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let b = Rc::new(Cons(10, RefCell::new(Rc::clone(&a))));
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println!("a rc count after b creation = {}", Rc::strong_count(&a));
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println!("b initial rc count = {}", Rc::strong_count(&b));
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println!("b next item = {:?}", b.tail());
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if let Some(link) = a.tail() {
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*link.borrow_mut() = Rc::clone(&b);
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}
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println!("b rc count after changing a = {}", Rc::strong_count(&b));
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println!("a rc count after changing a = {}", Rc::strong_count(&a));
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// Uncomment the next line to see that we have a cycle;
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// it will overflow the stack
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// println!("a next item = {:?}", a.tail());
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}
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#[derive(Debug)]
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struct Node {
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value: i32,
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parent: RefCell<Weak<Node>>,
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children: RefCell<Vec<Rc<Node>>>,
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}
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fn weakref_example() {
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let leaf = Rc::new(Node {
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value: 3,
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parent: RefCell::new(Weak::new()),
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children: RefCell::new(vec![]),
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});
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println!(
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"leaf strong = {}, weak = {}",
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Rc::strong_count(&leaf),
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Rc::weak_count(&leaf),
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);
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{
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let branch = Rc::new(Node {
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value: 5,
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parent: RefCell::new(Weak::new()),
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children: RefCell::new(vec![Rc::clone(&leaf)]),
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});
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*leaf.parent.borrow_mut() = Rc::downgrade(&branch);
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println!(
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"branch strong = {}, weak = {}",
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Rc::strong_count(&branch),
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Rc::weak_count(&branch),
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);
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println!(
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"leaf strong = {}, weak = {}",
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Rc::strong_count(&leaf),
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Rc::weak_count(&leaf),
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);
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}
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println!("leaf parent = {:?}", leaf.parent.borrow().upgrade());
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println!(
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"leaf strong = {}, weak = {}",
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Rc::strong_count(&leaf),
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Rc::weak_count(&leaf),
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);
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}
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fn main() {
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cycle_example();
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weakref_example();
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}
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