Struct frame_support::storage::types::OptionQuery
source · pub struct OptionQuery;Expand description
Implement QueryKindTrait with query being Option<Value>
NOTE: it doesn’t support a generic OnEmpty. This means only None can be
returned when no value is found. To use another OnEmpty implementation, ValueQuery can be
used instead.
Trait Implementations§
source§impl<Value> QueryKindTrait<Value, GetDefault> for OptionQuerywhere
Value: FullCodec + 'static,
impl<Value> QueryKindTrait<Value, GetDefault> for OptionQuerywhere
Value: FullCodec + 'static,
source§const METADATA: StorageEntryModifier = StorageEntryModifier::Optional
const METADATA: StorageEntryModifier = StorageEntryModifier::Optional
Metadata for the storage kind.
source§fn from_optional_value_to_query(v: Option<Value>) -> Self::Query
fn from_optional_value_to_query(v: Option<Value>) -> Self::Query
Convert an optional value (i.e. some if trie contains the value or none otherwise) to the
query. Read more
source§fn from_query_to_optional_value(v: Self::Query) -> Option<Value>
fn from_query_to_optional_value(v: Self::Query) -> Option<Value>
Convert a query to an optional value.
Auto Trait Implementations§
impl RefUnwindSafe for OptionQuery
impl Send for OptionQuery
impl Sync for OptionQuery
impl Unpin for OptionQuery
impl UnwindSafe for OptionQuery
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