add closure!

examples/arithmetic.rs

@@ -5,27 +5,27 @@ fn arithmetic(b: &plnk::Bencher) {
     let res = b.bench_multiple(vec![
         (
             plnk::label! { operation: "addition" }.to_string(),
-            Box::new(|| {
+            plnk::closure! {
                 let a = rand::thread_rng().gen::<u128>();
                 let b = rand::thread_rng().gen::<u128>();
                 plnk::timeit(|| a + b)
-            }),
+            },
         ),
         (
             plnk::label! { operation: "subtraction" }.to_string(),
-            Box::new(|| {
+            plnk::closure! {
                 let a = rand::thread_rng().gen::<u128>();
                 let b = rand::thread_rng().gen::<u128>();
                 plnk::timeit(|| a - b)
-            }),
+            },
         ),
         (
             plnk::label! { operation: "multiplication" }.to_string(),
-            Box::new(|| {
+            plnk::closure! {
                 let a = rand::thread_rng().gen::<u128>();
                 let b = rand::thread_rng().gen::<u128>();
                 plnk::timeit(|| a * b)
-            }),
+            },
         ),
     ]);
 
@@ -35,7 +35,7 @@ fn arithmetic(b: &plnk::Bencher) {
 fn random(b: &plnk::Bencher) {
     b.bench(
         plnk::label! { operation: "sampling" },
-        Box::new(|| plnk::timeit(|| rand::thread_rng().gen::<u128>())),
+        plnk::closure! { plnk::timeit(|| rand::thread_rng().gen::<u128>())},
     );
 }
 

src/lib.rs

@@ -161,6 +161,13 @@ impl Bencher {
     }
 }
 
+#[macro_export]
+macro_rules! closure {
+    ($( $body:stmt );* $(;)?) => {
+        Box::new(move || { $( $body )* })
+    };
+}
+
 #[macro_export]
 macro_rules! label {
     ( $( $key:ident : $value:expr ),* $(,)? ) => {{