[][src]Trait frame_support::storage::types::QueryKindTrait

pub trait QueryKindTrait<Value, OnEmpty> {
    type Query: FullCodec + 'static;

    pub const METADATA: StorageEntryModifier;

    pub fn from_optional_value_to_query(v: Option<Value>) -> Self::Query;
pub fn from_query_to_optional_value(v: Self::Query) -> Option<Value>; }

Trait implementing how the storage optional value is converted into the queried type.

It is implemented by:

Associated Types

type Query: FullCodec + 'static[src]

Type returned on query

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Associated Constants

pub const METADATA: StorageEntryModifier[src]

Metadata for the storage kind.

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Required methods

pub fn from_optional_value_to_query(v: Option<Value>) -> Self::Query[src]

Convert an optional value (i.e. some if trie contains the value or none otherwise) to the query.

pub fn from_query_to_optional_value(v: Self::Query) -> Option<Value>[src]

Convert a query to an optional value.

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Implementors

impl<Value> QueryKindTrait<Value, GetDefault> for OptionQuery where
    Value: FullCodec + 'static, 
[src]

impl<Value, OnEmpty> QueryKindTrait<Value, OnEmpty> for ValueQuery where
    Value: FullCodec + 'static,
    OnEmpty: Get<Value>, 
[src]

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