2019: intcode: rename method to get last output

aoc2019/src/day05.rs

@@ -21,7 +21,7 @@ fn part1(input: &str) -> Result<i64> {
     intcode.add_input(1);
     intcode.run()?;
     intcode
-        .get_day05_output()
+        .get_last_output()
         .ok_or_else(|| err!("intcode gave no output"))
 }
 
@@ -30,7 +30,7 @@ fn part2(input: &str) -> Result<i64> {
     intcode.add_input(5);
     intcode.run()?;
     intcode
-        .get_day05_output()
+        .get_last_output()
         .ok_or_else(|| err!("intcode gave no output"))
 }
 

aoc2019/src/day07.rs

@@ -58,7 +58,7 @@ fn part1(input: &str) -> Result<i64> {
             intcode.run()?;
 
             output = intcode
-                .get_day05_output()
+                .get_last_output()
                 .ok_or_else(|| err!("no output at end of pipeline!"))?;
         }
 

aoc2019/src/day09.rs

@@ -24,7 +24,7 @@ fn part1(memory: Vec<i64>) -> Result<i64> {
     intcode.add_input(1);
     intcode.run()?;
     intcode
-        .get_day05_output()
+        .get_last_output()
         .ok_or_else(|| err!("intcode output was empty!"))
 }
 
@@ -34,7 +34,7 @@ fn part2(memory: Vec<i64>) -> Result<i64> {
     intcode.add_input(2);
     intcode.run()?;
     intcode
-        .get_day05_output()
+        .get_last_output()
         .ok_or_else(|| err!("intcode output was empty!"))
 }
 

aoc2019/src/intcode/mod.rs

@@ -263,15 +263,7 @@ impl Intcode {
         self.memory.get(0).copied()
     }
 
-    pub fn get_day05_output(&self) -> Option<i64> {
-        for (i, out) in self.output.iter().enumerate() {
-            if i < self.output.len() - 1 {
-                assert_eq!(*out, 0);
-            } else {
-                return Some(*out);
-            }
-        }
-
-        None
+    pub fn get_last_output(&self) -> Option<i64> {
+        self.output.last().copied()
     }
 }