ruoruoniao opened a new issue, #3747:
URL: https://github.com/apache/fory/issues/3747
### Question
My cpp project is using like a plugin loader. I want to hide implement and
it can upgrade and compatible old version dll/so without rebuild. Like:
```cpp
//AImpl.h (Hide)
struct AImpl {
int a;
}
//A.h
class AImpl;
struct A {
... codes
auto a() const -> const int &;
auto a() -> int &;
auto a(int v) -> A &;
private:
AImpl * _impl = nullptr;
}
//A.cpp
... codes
```
But I cannot use `FORY_STRUCT` to register `A`. I can only make a new
`Serializer<A>`. That's all right, but it only can be register with
`register_extension_type<A>("A")`. Then, type id of `A` will be
`NAMED_EXT(32)`.
But if I use:
```python
//data.py
...codes
@dataclass
class A:
a: int = 0
```
Type id of `A` will be `NAMED_COMPATIBLE_STRUCT(32)`. I can route
`Serializer<A>` method into `Serializer<AImpl>`, then `A` can be
serialize/deserialize, but if I use a struct with `A`, like:
```cpp
struct B {
A a{};
};
```
It will skip a, because type id is `30` against `32`. (Correct if in cpp it
self.)
How can I use a pimpl class/struct under `xlang`? What is the best implement?
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