## ProvidedValue

# Type Alias ProvidedValue

Source

    pub type ProvidedValue<'tcx> = Option<&'tcx ItemLocalMap<Box<[TraitCandidate]>>>;

Expand description

This type alias specifies the type returned from query providers and the type used for decoding. For regular queries this is the declared returned type `V`, but `arena_cache` will use `<V as ArenaCached>::Provided` instead.

## Aliased Type§

    pub enum ProvidedValue<'tcx> {
        None,
        Some(&'tcx UnordMap<ItemLocalId, Box<[TraitCandidate]>>),
    }

## Variants§

§

### None

No value.

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### Some(&'tcx UnordMap<ItemLocalId, Box<[TraitCandidate]>>)

Some value of type `T`.

## Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.