[Custom construtor] How to bind a member function as a cumstom construtor?

[huangweiwu]

I have a existing class A with a member function create which return a shared_ptr object.
How to bind create as a cumtom construtor?
In Boost.Python, this can be achieved through the following approach.
.def("init", make_constructor(&A::create))

[wjakob]

You need to move the instance ourself:

.def("__init__", [](A* a) { new (a) (A::create()); });

[huangweiwu]

What if the create function is a template function and returns a shared_ptr?
Should I bind a nb::init<>() function instead of def("init") since we don't need to specify holder types in nanobind?