Macro wrap_storage_value 

macro_rules! wrap_storage_value {
    (storage: $storage: ident, name: $name: ident, value: $val: ty) => { ... };
}

Creates new type with specified name and value type and implements ValueStorage for it based on specified storage, which is a Substrate’s StorageValue.

This macro main purpose is to follow newtype pattern and avoid Substrate dependencies in gear_common.

Requires PhantomData be in scope: from std, core or sp_std.

Requires Config be in scope of the crate root where it called.