don't require Bencher to be mutable in `bench`

README.md

@@ -10,13 +10,13 @@ cargo add plnk --git https://gitlab.isae-supaero.fr/a.stevan/plnk --tag 0.2.0  #
 ```rust
 use rand::Rng;
 
-fn arithmetic(b: &mut plnk::Bencher) {
+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));
 }
 
-fn random(b: &mut plnk::Bencher) {
+fn random(b: &plnk::Bencher) {
     let mut rng = rand::thread_rng();
     plnk::bench(b, "sampling", || plnk::timeit(|| rng.gen::<u128>()));
 }
@@ -25,8 +25,8 @@ fn main() {
     const NB_MEASUREMENTS: usize = 10;
     let bencher = plnk::Bencher::new(NB_MEASUREMENTS);
 
-    arithmetic(&mut bencher.with_name("arithmetic"));
-    random(&mut bencher.with_name("random"));
+    arithmetic(&bencher.with_name("arithmetic"));
+    random(&bencher.with_name("random"));
 }
 ```
 

examples/arithmetic.rs

 use rand::Rng;
 
-fn arithmetic(b: &mut plnk::Bencher) {
+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));
 }
 
-fn random(b: &mut plnk::Bencher) {
+fn random(b: &plnk::Bencher) {
     let mut rng = rand::thread_rng();
     plnk::bench(b, "sampling", || plnk::timeit(|| rng.gen::<u128>()));
 }
@@ -15,6 +15,6 @@ fn main() {
     const NB_MEASUREMENTS: usize = 10;
     let bencher = plnk::Bencher::new(NB_MEASUREMENTS);
 
-    arithmetic(&mut bencher.with_name("arithmetic"));
-    random(&mut bencher.with_name("random"));
+    arithmetic(&bencher.with_name("arithmetic"));
+    random(&bencher.with_name("random"));
 }

examples/capture.rs

-fn capture(b: &mut plnk::Bencher) {
+fn capture(b: &plnk::Bencher) {
     let outer = 10;
     plnk::bench(b, "dummy", || {
         let inner = outer;
@@ -10,5 +10,5 @@ fn main() {
     const NB_MEASUREMENTS: usize = 10;
     let bencher = plnk::Bencher::new(NB_MEASUREMENTS);
 
-    capture(&mut bencher.with_name("capture"));
+    capture(&bencher.with_name("capture"));
 }

src/lib.rs

@@ -33,7 +33,7 @@ impl Bencher {
 /// same bencher
 /// - thing: the piece of code to run and measure
 /// - the measurements will be printed to STDOUT as JSON
-pub fn bench<F>(b: &mut Bencher, label: &str, mut thing: F)
+pub fn bench<F>(b: &Bencher, label: &str, mut thing: F)
 where
     F: FnMut() -> Duration,
 {