der: add EncodeRef/EncodeValueRef; remove OptionalRef#604
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Adds generic wrapper types for encoding references to types which impl encoding traits: - `EncodeRef`: impls `Encode` for &T where T: `Encode` - `EncodeValueRef`: impls `EncodeValue` and `Tagged` for &T This, in conjunction with impls for `&Option<T>`, eliminates the need to have a dedicated `OptionalRef` type. The `ContextSpecificRef` type is retained as it's a useful constructor for use in proc macros. All in all it would be nice to have a better solution like this, like a blanket impl of `Encode` for &T where T: `Encode`. That's a direction which may still be worth exploring, but in the meantime the wrapper types mean there's a generic solution for reference type encoding.
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Closes #527.
Adds generic wrapper types for encoding references to types which impl encoding traits:
EncodeRef: implsEncodefor &T where T:EncodeEncodeValueRef: implsEncodeValueandTaggedfor &TThis, in conjunction with impls for
&Option<T>, eliminates the need to have a dedicatedOptionalReftype.The
ContextSpecificReftype is retained as it's a useful constructor for use in proc macros.All in all it would be nice to have a better solution like this, like a blanket impl of
Encodefor &T where T:Encode. That's a direction which may still be worth exploring, but in the meantime the wrapper types mean there's a generic solution for reference type encoding.