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update impl syntax #313

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merged 1 commit into from
Oct 11, 2024
Merged

update impl syntax #313

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12 changes: 9 additions & 3 deletions moonbit-docs/docs/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1991,9 +1991,15 @@ trait ToMyBinaryProtocol {
}

impl ToMyBinaryProtocol for Int with to_my_binary_protocol(x, b) { ... }
impl ToMyBinaryProtocol for Int with to_my_binary_protocol(x, b) { ... }
impl ToMyBinaryProtocol for Int with to_my_binary_protocol(x, b) { ... }
impl[X : ToMyBinaryProtocol] for Array[X] with to_my_binary_protocol(arr, b) { ... }

impl ToMyBinaryProtocol for UInt with to_my_binary_protocol(x, b) { ... }

impl[X : ToMyBinaryProtocol] ToMyBinaryProtocol for Array[X] with to_my_binary_protocol(
arr,
b
) {
...
}
```

When searching for the implementation of a trait, `impl`s have a higher priority, so they can be used to override ordinary methods with undesirable behavior. `impl`s can only be used to implement the specified trait. They cannot be called directly like ordinary methods. Furthermore, _only the package of the type or the package of the trait can define an implementation_. For example, only `@pkg1` and `@pkg2` are allowed to define `impl @pkg1.Trait for @pkg2.Type` for type `@pkg2.Type`. This restriction ensures that MoonBit's trait system is still coherent with the extra flexibility of `impl`s.
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12 changes: 9 additions & 3 deletions moonbit-docs/i18n/zh/docusaurus-plugin-content-docs/current/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1965,9 +1965,15 @@ trait ToMyBinaryProtocol {
}
impl ToMyBinaryProtocol for Int with to_my_binary_protocol(x, b) { ... }
impl ToMyBinaryProtocol for Int with to_my_binary_protocol(x, b) { ... }
impl ToMyBinaryProtocol for Int with to_my_binary_protocol(x, b) { ... }
impl[X : ToMyBinaryProtocol] for Array[X] with to_my_binary_protocol(arr, b) { ... }
impl ToMyBinaryProtocol for UInt with to_my_binary_protocol(x, b) { ... }
impl[X : ToMyBinaryProtocol] ToMyBinaryProtocol for Array[X] with to_my_binary_protocol(
arr,
b
) {
...
}
```

在搜索某个接口的实现时，`impl` 比普通方法有更高的优先级，
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