1 files changed, 23 insertions, 0 deletions
diff --git a/src/identity_context.zig b/src/identity_context.zig
new file mode 100644
index 000000000..eefdca6b5
--- /dev/null
+++ b/src/identity_context.zig
@@ -0,0 +1,23 @@
+pub fn IdentityContext(comptime Key: type) type {
+    return struct {
+        pub fn hash(this: @This(), key: Key) u64 {
+            return key;
+        }
+
+        pub fn eql(this: @This(), a: Key, b: Key) bool {
+            return a == b;
+        }
+    };
+}
+
+/// When storing hashes as keys in a hash table, we don't want to hash the hashes or else we increase the chance of collisions. This is also marginally faster since it means hashing less stuff.
+/// `ArrayIdentityContext` and `IdentityContext` are distinct because ArrayHashMap expects u32 hashes but HashMap expects u64 hashes.
+const ArrayIdentityContext = struct {
+    pub fn hash(this: @This(), key: u32) u32 {
+        return key;
+    }
+
+    pub fn eql(this: @This(), a: u32, b: u32) bool {
+        return a == b;
+    }
+};