Revert "Actually, fuck the benchmark"

This reverts commit f66ee6c.

Author: meithecatte

Cargo.toml

@@ -23,6 +23,14 @@ optional = true
 [features]
 std = []
 
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "from_iterator"
+harness = false
+path = "benches/from_iterator.rs"
+
 [workspace]
 members = [
     "enumflags_derive",

benches/from_iterator.rs

@@ -0,0 +1,58 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use enumflags2::{bitflags, BitFlags};
+
+#[bitflags]
+#[repr(u16)]
+#[derive(Clone, Copy)]
+pub enum Test {
+    Flag1 = 1 << 0,
+    Flag2 = 1 << 1,
+    Flag3 = 1 << 2,
+    Flag4 = 1 << 3,
+    Flag5 = 1 << 4,
+    Flag6 = 1 << 5,
+    Flag7 = 1 << 6,
+    Flag8 = 1 << 7,
+    Flag9 = 1 << 8,
+    Flag10 = 1 << 9,
+    Flag11 = 1 << 10,
+}
+
+pub fn iterators(c: &mut Criterion) {
+    let v = vec![Test::Flag3, Test::Flag7, Test::Flag5, Test::Flag11];
+
+    let v2 = vec![Test::Flag10, Test::Flag3, Test::Flag1, Test::Flag4];
+
+    c.bench_function("simple iterator collect", |b| {
+        b.iter(|| black_box(&v).iter().copied().collect::<BitFlags<_>>())
+    });
+
+    c.bench_function("chained iterator collect", |b| {
+        b.iter(|| {
+            black_box(&v)
+                .iter()
+                .chain(black_box(&v2).iter())
+                .copied()
+                .collect::<BitFlags<_>>()
+        })
+    });
+
+    c.bench_function("simple iterator extend", |b| {
+        b.iter(|| {
+            let mut flags = BitFlags::empty();
+            flags.extend(black_box(&v).iter().copied());
+            flags
+        })
+    });
+
+    c.bench_function("chained iterator extend", |b| {
+        b.iter(|| {
+            let mut flags = BitFlags::empty();
+            flags.extend(black_box(&v).iter().chain(black_box(&v2).iter()).copied());
+            flags
+        })
+    });
+}
+
+criterion_group!(benches, iterators);
+criterion_main!(benches);