Lunderberg commented on PR #16832:
URL: https://github.com/apache/tvm/pull/16832#issuecomment-2045487082

   In the future, I'm wondering if the `CopyOnWrite` functionality should be 
extended to perform this type of initialization.  Currently, regardless of what 
invariants are established by an object's constructor, they can be violated 
when overwritten with `CopyOnWrite`.
   
   We could have `CopyOnWrite` return a proxy object, rather than 
`T::ContainerType*`.  The proxy object would provide `operator->`, so the same 
`obj.CopyOnWrite()->foo = new_foo` would still function as intended.  However, 
on destruction, the proxy object would call some `T::Validate` method.  That 
way, we get the usability of direct access and CoW to mutating a single field, 
but we can still establish invariants for classes.


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