add a linear example without iterators

Sponsored-by: author

1 files changed, 24 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 29de90f..8c9feec 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,6 +14,15 @@ fn main() {
     println!("{} ms", started.elapsed().as_millis());
     println!();
 
+    println!("linear iterator");
+    let started = Instant::now();
+    if let Err(e) = lineariter::checksums(&args.filenames) {
+        eprintln!("ERROR: {e}");
+        std::process::exit(1);
+    }
+    println!("{} ms", started.elapsed().as_millis());
+    println!();
+
     println!("rayon");
     let started = Instant::now();
     if let Err(e) = rayon::checksums(&args.filenames) {
@@ -37,6 +46,21 @@ mod linear {
     use std::path::PathBuf;
 
     pub fn checksums(filenames: &[PathBuf]) -> anyhow::Result<()> {
+        let mut sums = vec![];
+        for filename in filenames {
+            let sum = checksum(filename)?;
+            sums.push(sum);
+        }
+        print_checksums(&sums);
+        Ok(())
+    }
+}
+
+mod lineariter {
+    use checksums::*;
+    use std::path::PathBuf;
+
+    pub fn checksums(filenames: &[PathBuf]) -> anyhow::Result<()> {
         let checksums: Result<Vec<FileChecksum>, std::io::Error> = filenames
             .iter()
             .map(|filename| checksum(filename))