iterutil crate

crates/iterutil/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "iterutil"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]

crates/iterutil/src/exact_size.rs

@@ -0,0 +1,25 @@
+/// Similar to `IntoIterator`, but for an iterator with an exact size.
+pub trait IntoExactSizeIterator {
+    type Item;
+    type IntoIter: ExactSizeIterator<Item = Self::Item>;
+
+    /// Converts self into the `ExactSizeIteror`.
+    fn into_iter(self) -> Self::IntoIter;
+}
+
+impl<I> IntoExactSizeIterator for I
+where
+    I: IntoIterator,
+    I::IntoIter: ExactSizeIterator,
+{
+    type Item = I::Item;
+    type IntoIter = I::IntoIter;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.into_iter()
+    }
+}
+
+pub trait FromExactSizeIterator<A>: Sized {
+    fn from_iter<T: IntoExactSizeIterator<Item = A>>(iter: T) -> Self;
+}

crates/iterutil/src/lib.rs

@@ -0,0 +1 @@
+pub mod exact_size;

crates/rayexec_execution/Cargo.toml

@@ -10,6 +10,7 @@ rayexec_parser = { path = "../rayexec_parser" }
 rayexec_bullet = { path = "../rayexec_bullet" }
 rayexec_io = { path = "../rayexec_io" }
 fmtutil = { path = "../fmtutil" }
+iterutil = { path = "../iterutil" }
 # stackutil = { path = "../stackutil" } TODO: psm hash issues when compiling to wasm on macos
 
 ahash = { workspace = true }

crates/rayexec_execution/src/arrays/mod.rs

@@ -0,0 +1 @@
+

crates/rayexec_execution/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod arrays;
 pub mod config;
 pub mod database;
 pub mod datasource;