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Update methods.md (#247)

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Adding a Q/A about `impl<T> Point<T>`, why is it specified twice.
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Igor Petruk 2023-01-23 13:38:53 +00:00 committed by GitHub
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src/generics/methods.md
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@ -19,3 +19,13 @@ fn main() {
println!("p.x = {}", p.x());
}
```
<details>
* *Q:* Why `T` is specified twice in `impl<T> Point<T> {}`? Isn't that redundant?
* This is because it is a generic implementation section for generic type. They are independently generic.
* It means these methods are defined for any `T`.
* It is possible to write `impl Point<u32> { .. }`.
* `Point` is still generic and you can use `Point<f64>`, but methods in this block will only be available for `Point<u32>`.
</details>