Vendor things

third-party/vendor/generator/examples/pipe.rs

@@ -0,0 +1,29 @@
+use generator::*;
+
+fn main() {
+    // fn square<'a, T: Iterator<Item = u32> + 'a>(input: T) -> impl Iterator<Item = u32> + 'a {
+    fn square<'a, T: Iterator<Item = u32> + Send + 'a>(input: T) -> Generator<'a, (), u32> {
+        Gn::new_scoped(|mut s| {
+            for i in input {
+                s.yield_with(i * i);
+            }
+            done!();
+        })
+    }
+
+    // fn sum<'a, T: Iterator<Item = u32> + 'a>(input: T) -> impl Iterator<Item = u32> + 'a {
+    fn sum<'a, T: Iterator<Item = u32> + Send + 'a>(input: T) -> Generator<'a, (), u32> {
+        Gn::new_scoped(|mut s| {
+            let mut acc = 0;
+            for i in input {
+                acc += i;
+                s.yield_with(acc);
+            }
+            done!();
+        })
+    }
+
+    for (i, sum) in sum(square(0..20)).enumerate() {
+        println!("square_sum_{i:<2} = {sum:^4}");
+    }
+}