From 65f88596cba53e710b0435bea488462719a1c55b Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Thu, 31 Jan 2019 14:00:49 -0500
Subject: [PATCH] Add lifetime generic example

---
 .idea/misc.xml        |  1 +
 .idea/rust.iml        |  5 +++
 .idea/workspace.xml   | 94 ++++++++++++++++++-------------------------
 lifetimes/Cargo.toml  |  7 ++++
 lifetimes/src/main.rs | 57 ++++++++++++++++++++++++++
 5 files changed, 109 insertions(+), 55 deletions(-)
 create mode 100644 lifetimes/Cargo.toml
 create mode 100644 lifetimes/src/main.rs

diff --git a/.idea/misc.xml b/.idea/misc.xml
index 92170b1..c897734 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -18,6 +18,7 @@
     <cargoProject FILE="$PROJECT_DIR$/errors/Cargo.toml" />
     <cargoProject FILE="$PROJECT_DIR$/largest_number/src/main.rs" />
     <cargoProject FILE="$PROJECT_DIR$/generics/Cargo.toml" />
+    <cargoProject FILE="$PROJECT_DIR$/lifetimes/Cargo.toml" />
   </component>
   <component name="ComposerJsonPluginSettings">
     <unboundedVersionInspectionSettings>
diff --git a/.idea/rust.iml b/.idea/rust.iml
index 454cb85..d704567 100644
--- a/.idea/rust.iml
+++ b/.idea/rust.iml
@@ -70,6 +70,10 @@
       <sourceFolder url="file://$MODULE_DIR$/generics/examples" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/generics/tests" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/generics/benches" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/lifetimes/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/lifetimes/examples" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/lifetimes/tests" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/lifetimes/benches" isTestSource="true" />
       <excludeFolder url="file://$MODULE_DIR$/branches/target" />
       <excludeFolder url="file://$MODULE_DIR$/ctof/target" />
       <excludeFolder url="file://$MODULE_DIR$/enums/target" />
@@ -78,6 +82,7 @@
       <excludeFolder url="file://$MODULE_DIR$/functions/target" />
       <excludeFolder url="file://$MODULE_DIR$/generics/target" />
       <excludeFolder url="file://$MODULE_DIR$/guessing_game/target" />
+      <excludeFolder url="file://$MODULE_DIR$/lifetimes/target" />
       <excludeFolder url="file://$MODULE_DIR$/loops/target" />
       <excludeFolder url="file://$MODULE_DIR$/modules/target" />
       <excludeFolder url="file://$MODULE_DIR$/rectangles/target" />
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 5bf83ff..450a7a3 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -14,42 +14,14 @@
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/generics/src/main.rs">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="192">
-              <caret line="12" column="9" lean-forward="true" selection-start-line="12" selection-start-column="9" selection-end-line="12" selection-end-column="9" />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/generics/src/point.rs">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="544">
-              <caret line="34" lean-forward="true" selection-start-line="34" selection-end-line="34" />
-              <folding>
-                <element signature="e#548#549#0" expanded="true" />
-                <element signature="e#570#571#0" expanded="true" />
-                <element signature="e#665#666#0" expanded="true" />
-                <element signature="e#720#721#0" expanded="true" />
-              </folding>
-            </state>
-          </provider>
-        </entry>
-      </file>
       <file pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/generics/src/lib.rs">
+        <entry file="file://$PROJECT_DIR$/lifetimes/src/main.rs">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="256">
-              <caret line="16" column="54" selection-start-line="16" selection-start-column="54" selection-end-line="16" selection-end-column="54" />
+            <state relative-caret-position="912">
+              <caret line="57" lean-forward="true" selection-start-line="57" selection-end-line="57" />
               <folding>
+                <element signature="e#111#112#0" expanded="true" />
                 <element signature="e#127#128#0" expanded="true" />
-                <element signature="e#171#172#0" expanded="true" />
-                <element signature="e#382#383#0" expanded="true" />
-                <element signature="e#420#421#0" expanded="true" />
-                <element signature="e#782#783#0" expanded="true" />
-                <element signature="e#826#827#0" expanded="true" />
               </folding>
             </state>
           </provider>
@@ -104,6 +76,7 @@
         <option value="$PROJECT_DIR$/generics/src/main.rs" />
         <option value="$PROJECT_DIR$/generics/src/point.rs" />
         <option value="$PROJECT_DIR$/generics/src/lib.rs" />
+        <option value="$PROJECT_DIR$/lifetimes/src/main.rs" />
       </list>
     </option>
   </component>
@@ -137,12 +110,12 @@
             <path>
               <item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
               <item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
-              <item name="generics" type="9f88c78c:ScopeViewTreeModel$FileNode" />
+              <item name="lifetimes" type="9f88c78c:ScopeViewTreeModel$FileNode" />
             </path>
             <path>
               <item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
               <item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
-              <item name="generics" type="9f88c78c:ScopeViewTreeModel$FileNode" />
+              <item name="lifetimes" type="9f88c78c:ScopeViewTreeModel$FileNode" />
               <item name="src" type="9f88c78c:ScopeViewTreeModel$FileNode" />
             </path>
           </expand>
@@ -176,7 +149,7 @@
   </component>
   <component name="PropertiesComponent">
     <property name="JavaScriptWeakerCompletionTypeGuess" value="true" />
-    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1548952830934" />
+    <property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1548960808738" />
     <property name="javascript.nodejs.core.library.configured.version" value="7.1.0" />
     <property name="js.eslint.eslintPackage" value="$USER_HOME$/.yarn-config/global/node_modules/.bin/eslint" />
     <property name="js.eslint.nodeInterpreter" value="project" />
@@ -204,7 +177,7 @@
       </list>
     </option>
   </component>
-  <component name="RunManager" selected="Cargo Command.Run generics">
+  <component name="RunManager" selected="Cargo Command.Run lifetimes">
     <configuration name="&lt;template&gt;" type="TestNG" default="true" selected="false">
       <option name="MAIN_CLASS_NAME" />
       <option name="VM_PARAMETERS" value="-ea" />
@@ -223,16 +196,6 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="Run enums" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
-      <option name="channel" value="DEFAULT" />
-      <option name="command" value="run --package enums --bin enums" />
-      <option name="allFeatures" value="false" />
-      <option name="nocapture" value="false" />
-      <option name="backtrace" value="SHORT" />
-      <option name="workingDirectory" value="file://$PROJECT_DIR$/enums" />
-      <envs />
-      <method v="2" />
-    </configuration>
     <configuration name="Run errors" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
       <option name="channel" value="DEFAULT" />
       <option name="command" value="run --package errors --bin errors" />
@@ -263,6 +226,16 @@
       <envs />
       <method v="2" />
     </configuration>
+    <configuration name="Run lifetimes" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
+      <option name="channel" value="DEFAULT" />
+      <option name="command" value="run --package lifetimes --bin lifetimes" />
+      <option name="allFeatures" value="false" />
+      <option name="nocapture" value="false" />
+      <option name="backtrace" value="SHORT" />
+      <option name="workingDirectory" value="file://$PROJECT_DIR$/lifetimes" />
+      <envs />
+      <method v="2" />
+    </configuration>
     <configuration name="Run modules" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
       <option name="channel" value="DEFAULT" />
       <option name="command" value="run --package modules --bin modules" />
@@ -282,11 +255,11 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="Cargo Command.Run lifetimes" />
         <item itemvalue="Cargo Command.Run generics" />
         <item itemvalue="Cargo Command.Run largest_number" />
         <item itemvalue="Cargo Command.Run errors" />
         <item itemvalue="Cargo Command.Run modules" />
-        <item itemvalue="Cargo Command.Run enums" />
       </list>
     </recent_temporary>
   </component>
@@ -510,6 +483,21 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/generics/src/lib.rs">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="128">
+          <caret line="8" column="32" lean-forward="true" selection-start-line="8" selection-start-column="32" selection-end-line="8" selection-end-column="32" />
+          <folding>
+            <element signature="e#127#128#0" expanded="true" />
+            <element signature="e#171#172#0" expanded="true" />
+            <element signature="e#382#383#0" expanded="true" />
+            <element signature="e#420#421#0" expanded="true" />
+            <element signature="e#782#783#0" expanded="true" />
+            <element signature="e#826#827#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/generics/src/point.rs">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="544">
@@ -530,17 +518,13 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/generics/src/lib.rs">
+    <entry file="file://$PROJECT_DIR$/lifetimes/src/main.rs">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="256">
-          <caret line="16" column="54" selection-start-line="16" selection-start-column="54" selection-end-line="16" selection-end-column="54" />
+        <state relative-caret-position="912">
+          <caret line="57" lean-forward="true" selection-start-line="57" selection-end-line="57" />
           <folding>
+            <element signature="e#111#112#0" expanded="true" />
             <element signature="e#127#128#0" expanded="true" />
-            <element signature="e#171#172#0" expanded="true" />
-            <element signature="e#382#383#0" expanded="true" />
-            <element signature="e#420#421#0" expanded="true" />
-            <element signature="e#782#783#0" expanded="true" />
-            <element signature="e#826#827#0" expanded="true" />
           </folding>
         </state>
       </provider>
diff --git a/lifetimes/Cargo.toml b/lifetimes/Cargo.toml
new file mode 100644
index 0000000..f219582
--- /dev/null
+++ b/lifetimes/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "lifetimes"
+version = "0.1.0"
+authors = ["Timothy Warren <twarren@nabancard.com>"]
+edition = "2018"
+
+[dependencies]
diff --git a/lifetimes/src/main.rs b/lifetimes/src/main.rs
new file mode 100644
index 0000000..2814dd9
--- /dev/null
+++ b/lifetimes/src/main.rs
@@ -0,0 +1,57 @@
+use std::fmt::Display;
+
+struct ImportantExcerpt<'a> {
+    part: &'a str,
+}
+
+impl<'a> ImportantExcerpt<'a> {
+    fn level(&self) -> i32 {
+        3
+    }
+
+    fn announce_and_return_part(&self, announcement: &str) -> &str {
+        println!("Attention please: {}", announcement);
+        self.part
+    }
+}
+
+fn main() {
+    let string1 = String::from("abcd");
+    let string2 = "xyz";
+
+    let result = longest(string1.as_str(), string2);
+    println!("The longest string is {}", result);
+
+    let string1 = String::from("long string is long");
+
+    {
+        let string2 = String::from("xyz");
+        let result = longest(string1.as_str(), string2.as_str());
+        println!("The longest string is {}", result);
+    }
+
+    let novel = String::from("Call me Ishmael. Some years ago...");
+    let first_sentence = novel.split('.')
+        .next()
+        .expect("Could not find a '.'");
+    let _i = ImportantExcerpt { part: first_sentence };
+}
+
+fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
+    if x.len() > y.len() {
+        x
+    } else {
+        y
+    }
+}
+
+fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
+    where T: Display
+{
+    println!("Announcement! {}", ann);
+    if x.len() > y.len() {
+        x
+    } else {
+        y
+    }
+}