From cf2419b1a9f04e89a63cc2ac2bc35a3b60ec8f0b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Kijewski?= <rene.kijewski@fu-berlin.de>
Date: Sat, 22 Jun 2024 15:54:58 +0200
Subject: [PATCH] derive: bench in batches

Cloning a TokenStream is not for free. This change lets criterion do the
cloning outside of the measured time, and blackboxing is done by
criterion, too.

The benchmark runs ~10% faster, now.
---
 rinja_derive_standalone/benches/derive-template.rs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/rinja_derive_standalone/benches/derive-template.rs b/rinja_derive_standalone/benches/derive-template.rs
index faf231ab..9b4bd210 100644
--- a/rinja_derive_standalone/benches/derive-template.rs
+++ b/rinja_derive_standalone/benches/derive-template.rs
@@ -1,4 +1,4 @@
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, BatchSize, Criterion};
 use quote::quote;
 
 criterion_main!(benches);
@@ -19,7 +19,9 @@ fn hello_world(b: &mut criterion::Bencher<'_>) {
             user: &'a str,
         }
     };
-    b.iter(|| {
-        rinja_derive_standalone::derive_template2(black_box(&ts).clone());
-    })
+    b.iter_batched(
+        || ts.clone(),
+        |ts| rinja_derive_standalone::derive_template2(ts),
+        BatchSize::LargeInput,
+    );
 }