add associated constructor to `Dimension` trait
評估
- 難度
- 5/5
- 預估耗時
- 一週以上
- 新手友好度
- 35/100
- Issue 類型
- 功能
- 描述清晰度
- 基本清楚
- 活躍度
- 冷清
- 技術堆疊
- rust
研究方向
Start by reading the Dimension trait and the interp_array method in ndarray-interp, focusing on how the output dimension is constructed for static dimensions and IxDyn. Define and validate an associated constructor or conversion from a slice that preserves dynamic dimensionality, rejects incompatible static dimensions, and remains suitable for custom Dimension implementations.
由索引模型根據 Issue 內容生成。
描述
I am working on the ndarray-interp crate, which is generic over the number of dimensions. This causes difficulties when the I need to construct a Dimension that is bigger than 6 (IxDyn).
Specifically the method interp_array needs to generically construct its return array of Dimension <Dq as DimAdd<D::Smaller>>::Output where Dq: Dimension + DimAdd<D::Smaller>.
This works fine for static dimensions as I can use the Default trait to create the correct Dimension. But when <Dq as DimAdd<D::Smaller>>::Output happens to be IxDyn this does not work because the information about the number of dimensions is lost.
This is my current, very ugly solution:
let shape = match <Dq as DimAdd<D::Smaller>>::Output::NDIM {
Some(_) => {
let mut dim = <Dq as DimAdd<D::Smaller>>::Output::default();
dim.as_array_view_mut()
.into_iter()
// ... set the correct axis lenghts
;
dim
}
None => {
let lenghts: Vec<usize> = ; // ... collect the correct axis lenghts
let dyn_dim = IxDyn(&lenghts);
(&dyn_dim as &dyn Any)
.downcast_ref::<<Dq as DimAdd<D::Smaller>>::Output>()
.unwrap_or_else(|| unimplemented!())
.clone()
}
};
This requires ndarray to guarantee that Dimension::NDIM is only ever None when the underlying type is IxDyn. If there is ever a impl Dimension for NewType this code will probably brake.
I might have missed something, but there does not seem to be a good solution for this problem currently.
I suggest extending the Dimenion trait, possibly by requiring Dimension: TryFrom<&[Ix]> or adding a associated constructor:
trait Dimension {
/// try to create a new Dimension from the provided slice
/// fails when `Self::NDIM.is_some_and(|ndim| ndim != ix.len())`
fn try_new(ix: &[Ix]) -> Option<Self>;
}
- 主要語言
- Rust
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- 4.3k
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- 391
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