add label! and sample random numbers in exemple

examples/arithmetic.rs

@@ -2,9 +2,23 @@ use clap::Parser;
 use rand::Rng;
 
 fn arithmetic(b: &plnk::Bencher) {
-    plnk::bench(b, "addition", || plnk::timeit(|| 1 + 2));
-    plnk::bench(b, "substraction", || plnk::timeit(|| 1 - 2));
-    plnk::bench(b, "multiplication", || plnk::timeit(|| 2 * 3));
+    let mut rng = rand::thread_rng();
+
+    plnk::bench(b, plnk::label! { operation: "addition" }, || {
+        let a = rng.gen::<u128>();
+        let b = rng.gen::<u128>();
+        plnk::timeit(|| a + b)
+    });
+    plnk::bench(b, plnk::label! { operation: "substraction" }, || {
+        let a = rng.gen::<u128>();
+        let b = rng.gen::<u128>();
+        plnk::timeit(|| a - b)
+    });
+    plnk::bench(b, plnk::label! { operation: "multiplication" }, || {
+        let a = rng.gen::<u128>();
+        let b = rng.gen::<u128>();
+        plnk::timeit(|| a * b)
+    });
 }
 
 fn random(b: &plnk::Bencher) {

src/lib.rs

@@ -29,6 +29,17 @@ impl Bencher {
     }
 }
 
+#[macro_export]
+macro_rules! label {
+    ( $( $key:ident : $value:expr ),* $(,)? ) => {{
+        let mut parts = Vec::new();
+        $(
+            parts.push(format!("{}: {:?}", stringify!($key), $value));
+        )*
+        &format!("{{{}}}", parts.join(", "))
+    }};
+}
+
 /// run a given piece of code a bunch of times and output the measurements
 ///
 /// - label: an additional label to differentiate similar but different things to benchmark in the
@@ -50,10 +61,7 @@ where
         pb.inc(1);
     }
 
-    println!(
-        r#"{{"label": "{}", "name": "{}", "times": {:?}}}"#,
-        label, b.name, times
-    );
+    println!("{}", label! { label: label, name: b.name, times: times });
 }
 
 /// measure the time it takes to do something