Index: src/object.c
==================================================================
--- src/object.c
+++ src/object.c
@@ -116,10 +116,18 @@
 	if (obj->cls->dtor != NULL)
 		obj->cls->dtor(obj);
 
 	free(obj);
 }
+
+bool
+cfw_is(void *ptr, CFWClass *cls)
+{
+	CFWObject *obj = ptr;
+
+	return (obj->cls == cls);
+}
 
 bool
 cfw_equal(void *ptr1, void *ptr2)
 {
 	CFWObject *obj1 = ptr1, *obj2 = ptr2;

Index: src/object.h
==================================================================
--- src/object.h
+++ src/object.h
@@ -38,10 +38,11 @@
 extern void* cfw_new(CFWClass*, ...);
 extern void* cfw_new_p(CFWClass*, ...);
 extern void* cfw_ref(void*);
 extern void cfw_unref(void*);
 extern void cfw_free(void*);
+extern bool cfw_is(void*, CFWClass*);
 extern bool cfw_equal(void*, void*);
 extern uint32_t cfw_hash(void*);
 extern void* cfw_copy(void*);
 
 #endif