From 352085f8d9cd3509fbdc6f7bea5d2e47e0392498 Mon Sep 17 00:00:00 2001
From: Stephan Rehfeld <stephan.rehfeld@th-nuernberg.de>
Date: Wed, 22 Apr 2026 18:25:24 +0200
Subject: [PATCH] We need lifitime annotation, when struct wants to old a
 reference.

---
 src/main.rs | 46 ++++++++++++++--------------------------------
 1 file changed, 14 insertions(+), 32 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index cc74d50..378aec2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,6 +19,16 @@ impl RGB {
     }
 }
 
+struct Container<'a> {
+    value: &'a RGB,
+}
+
+impl<'a> Container<'a> {
+    fn new(value: &RGB) -> Container {
+        Container { value }
+    }
+}
+
 struct Image {
     width: usize,
     height: usize,
@@ -59,40 +69,12 @@ impl Image {
     }
 }
 
-fn manipulate_first_pixel(image: &mut Image) {
-    let c = image.get_mut(0, 0);
-
-    c.red = 0;
-}
-
 fn main() {
-    let mut image = Image::white_image(640, 480);
+    let image = Image::white_image(640, 480);
 
-    manipulate_first_pixel(&mut image);
+    let c = image.get(0, 0);
 
-    let mut_c1 = image.get_mut(0, 0);
+    let container = Container::new(c);
 
-    println!(
-        "red = {}, green = {}, blue = {}",
-        mut_c1.red, mut_c1.green, mut_c1.blue
-    );
-
-    let mut_c2 = image.get_mut(0, 0);
-
-    /*let c1 = image.get(0, 0);
-    let c2 = image.get(0, 0);
-    let c3 = image.get(0, 0);
-    let c4 = image.get(0, 0);
-    let c5 = image.get(0, 0);
-
-    println!("red = {}, green = {}, blue = {}", c1.red, c1.green, c1.blue);
-    println!("red = {}, green = {}, blue = {}", c2.red, c2.green, c2.blue);
-    println!("red = {}, green = {}, blue = {}", c3.red, c3.green, c3.blue);
-    println!("red = {}, green = {}, blue = {}", c4.red, c4.green, c4.blue);
-    println!("red = {}, green = {}, blue = {}", c5.red, c5.green, c5.blue);*/
-
-    println!(
-        "red = {}, green = {}, blue = {}",
-        mut_c2.red, mut_c2.green, mut_c2.blue
-    );
+    println!("{}", container.value.blue);
 }