NekoiNemo
Advanced Hands-on Rust: get_handle is unwieldy (page 118)
The function body as it’s presented is quite unwieldy. It was probably a good opportunity to point out to the audience that ? can also be used to shortcirquit an Option as well, not just a Result:
impl AssetStore {
pub fn get_handle<T>(&self, index: &str, assets: &LoadedAssets)
-> Option<Handle<T>>
where T: Asset,
{
if let Some(handle_untyped) = self.asset_index.get(index) {
if let Some(handle) = assets.get(handle_untyped) {
return Some(handle.handle.clone().typed::<T>());
}
None
} else {
None
}
}
}
into
impl AssetStore {
pub fn get_handle<T: Asset>(&self, index: &str, assets: &LoadedAssets) -> Option<Handle<T>> {
let handle_untyped = self.asset_index.get(index)?;
let handle = assets.get(handle_untyped)?;
Some(handle.handle.clone().typed::<T>())
}
}
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