feat(divan_compat): add drop example

Author: not-matthias

crates/divan_compat/Cargo.toml

@@ -29,3 +29,7 @@ harness = false
 [[bench]]
 name = "sleep_benches"
 harness = false
+
+[[bench]]
+name = "drop_example"
+harness = false

crates/divan_compat/benches/drop_example.rs

@@ -0,0 +1,45 @@
+use codspeed_divan_compat::Bencher;
+
+struct LargeInput {
+    data: Vec<u8>,
+}
+
+impl Drop for LargeInput {
+    #[inline(never)]
+    fn drop(&mut self) {
+        // Simulate a large drop by performing some computation
+        let sum: u8 = self.data.iter().copied().sum();
+        std::hint::black_box(sum); // Prevent optimization
+    }
+}
+
+impl LargeInput {
+    fn new() -> Self {
+        Self {
+            data: vec![42; 1024 * 1024 /* 1MiB */],
+        }
+    }
+
+    fn process(&self) -> u64 {
+        // Simulate some work on the data
+        std::thread::sleep(std::time::Duration::from_millis(50));
+        self.data.iter().map(|&x| x as u64).sum()
+    }
+}
+
+#[codspeed_divan_compat::bench]
+fn bench_large_input(bencher: Bencher) {
+    bencher
+        .with_inputs(LargeInput::new)
+        .bench_values(|input| input.process());
+}
+
+#[codspeed_divan_compat::bench]
+fn bench_large_input_local(bencher: Bencher) {
+    let input = LargeInput::new();
+    bencher.bench_local(|| input.process());
+}
+
+fn main() {
+    codspeed_divan_compat::main();
+}