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Previously we could only downcast to &dyn Trait,
which is not adequate.
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This simplifies our implementation logic in a few places,
and simplifies our invocation syntax greatly. There are a few
infelicities, noted in `TODO RPC` comments.
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It's now not actually possible to write code that doesn't work, even
if `Tr` *isn't* 'static, because of the bounds on `CastTable::insert`.
I tried to produce a non-working setup with a non-static `Simple`, but
you can't implement `Object` for such a thing. Removing 'static from
Object would stop the downcasts from Any to Object working.
Prior to the new typesafe insert, this change
- let f: fn(&dyn $crate::Object) -> &(dyn $traitname + 'static) = |self_| {
+ let f: fn(&dyn $crate::Object) -> &(dyn $traitname) = |self_| {
would result in a runtime crash. Now it results in a compiler error.
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This was locally bound to `S` in one place. Bind and use it throughout.
Since this is an RPC object, `O` is a better name.
In each item, use the description once and thereafter just the name.
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This checks the Requirements.
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This is a rather tricky piece of functionality. It works as
follows.
We introduce a `CastTable` type. Each `CastTable` tells us how to
downcast `dyn Object` for objects of a single concrete type.
The `Object` type now has a `get_casttable` method that returns
an empty `CastTable` by default.
`CastTable` is, internally, a map from the `TypeId` of the target
dyn Trait reference type to a function
`fn(&dyn Object) -> &dyn Trait`. These functions are stored as
`Box<dyn Any + ...>`. (They are Boxed because they may refer to
generic functions, which you can't get a static reference to,
and they're Any because the functions have different types.)
The `decl_object!` macro now implements `get_casttable` as
appropriate. (The syntax is a bit janky, but that's what we get
for not using derive_adhoc.) For non-generic types, `get_casttable`
uses a Lazy<CastTable>`. to initialize a CastTable exactly once.
For generic types, it use a `Lazy<RwLock<HashMap<..>>` to
build one CastTable per instantiation of the generic type.
This could probably be optimized a bit more, the yaks could be
shaved in a more scintillating hairstyle, and the syntax for
generic `decl_object` could definitely be improved.
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