Make `ItemTreeId` its own type

1 files changed, 41 insertions, 1 deletions

diff --git a/crates/hir_def/src/item_tree.rs b/crates/hir_def/src/item_tree.rs
index 90df3d929..8383780e0 100644
--- a/crates/hir_def/src/item_tree.rs
+++ b/crates/hir_def/src/item_tree.rs
@@ -401,7 +401,47 @@ impl<N: ItemTreeNode> fmt::Debug for FileItemTreeId<N> {
     }
 }
 
-pub type ItemTreeId<N> = InFile<FileItemTreeId<N>>;
+#[derive(Debug)]
+pub struct ItemTreeId<N: ItemTreeNode> {
+    file: HirFileId,
+    pub value: FileItemTreeId<N>,
+}
+
+impl<N: ItemTreeNode> ItemTreeId<N> {
+    pub fn new(file: HirFileId, idx: FileItemTreeId<N>) -> Self {
+        Self { file, value: idx }
+    }
+
+    pub fn file_id(self) -> HirFileId {
+        self.file
+    }
+
+    pub fn item_tree(self, db: &dyn DefDatabase) -> Arc<ItemTree> {
+        db.item_tree(self.file)
+    }
+}
+
+impl<N: ItemTreeNode> Copy for ItemTreeId<N> {}
+impl<N: ItemTreeNode> Clone for ItemTreeId<N> {
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl<N: ItemTreeNode> PartialEq for ItemTreeId<N> {
+    fn eq(&self, other: &Self) -> bool {
+        self.file == other.file && self.value == other.value
+    }
+}
+
+impl<N: ItemTreeNode> Eq for ItemTreeId<N> {}
+
+impl<N: ItemTreeNode> Hash for ItemTreeId<N> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.file.hash(state);
+        self.value.hash(state);
+    }
+}
 
 macro_rules! mod_items {
     ( $( $typ:ident in $fld:ident -> $ast:ty ),+ $(,)? ) => {