Add isAliasOf for seeing if two embind handles point to the same underlying object.

Conflicts:
	tests/embind/embind_test.cpp

1 files changed, 18 insertions, 2 deletions

diff --git a/src/embind/embind.js b/src/embind/embind.js
index 78f54e31..cadee700 100755
--- a/src/embind/embind.js
+++ b/src/embind/embind.js
@@ -1061,8 +1061,24 @@ ClassHandle.prototype.isAliasOf = function(other) {
     if (!(other instanceof ClassHandle)) {
         return false;
     }
-    return this.$$.ptr == other.$$.ptr;
-}
+
+    var leftClass = this.$$.ptrType.registeredClass;
+    var left = this.$$.ptr;
+    var rightClass = other.$$.ptrType.registeredClass;
+    var right = other.$$.ptr;
+
+    while (leftClass.baseClass) {
+        left = leftClass.upcast(left);
+        leftClass = leftClass.baseClass;
+    }
+
+    while (rightClass.baseClass) {
+        right = rightClass.upcast(right);
+        rightClass = rightClass.baseClass;
+    }
+    
+    return leftClass === rightClass && left === right;
+};
 
 ClassHandle.prototype.clone = function() {
     if (!this.$$.ptr) {