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docs(r): say which class owns a setMethod() written with a multi-class signature

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Mick Cooney 2026-10-17 18:00:26 +01:00
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docs/languages/r-provider.md
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@ -16,6 +16,7 @@ Definitions:
- Functions defined by assignment (`<-`, `=`, `<<-`). S3 methods appear as ordinary functions with dotted names such as `print.foo`.
- S4 classes (`setClass`), generics (`setGeneric`), methods (`setMethod`) and slots (`representation`, `slots`).
- A `setMethod()` is owned by the class its signature names: the string, or the first argument of `signature(...)` or `c(...)`. A method on several classes (multiple dispatch) belongs to its first class, so `signature("A", "B")` and `signature("A", "C")` give one method of `A` (the first written wins) and a signature whose first argument is not a string names no owner.
- R6 classes with their methods, fields and active bindings.
- RefClass (`setRefClass`) classes with their methods and fields.
- Slots and fields given as `list(...)`, `representation(...)` or `c(...)`. A named entry (`c(a = "numeric")`) records its type; an unnamed string in `slots = c("a", "b")` or `fields = c("a", "b")` names an untyped member, as in R. An unnamed string in `representation(...)` or `list(...)` is not a member.