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improved explanation for kernel only classes

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pca006132 2021-04-12 19:58:45 +08:00
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@ -110,12 +110,13 @@ def fail_write() -> None:
* Only `uint32`, `int32` (and range of them) can be used as index.
### Kernel Only class
* Annotate the class with `@kernel`.
* Functions are all kernel only, including constructor.
Questions:
* Should we also do `@portable`?
* Support inheritance and polymorphism?
* Annotate the class with `@kernel`/`@portable`.
* The instance can be created from within kernel functions, or the host if it is
portable. It can be passed into kernels.
* All methods, including the constructor, are treated as kernel/portable
functions that would be compiled by the compiler, no RPC function is allowed.
* If the instance is passed into the kernel, the host is not allowed to access
the instance data. Access would raise exception.
## Generics
We use [type variable](https://docs.python.org/3/library/typing.html#typing.TypeVar) for denoting generics.