Function sp_io::default_child_storage::read [−][src]
pub fn read(
storage_key: &[u8],
key: &[u8],
value_out: &mut [u8],
value_offset: u32
) -> Option<u32>
Allocation efficient variant of get.
Get key from child storage, placing the value into value_out and return the number
of bytes that the entry in storage has beyond the offset or None if the storage entry
doesn't exist at all.
If value_out length is smaller than the returned length, only value_out length bytes
are copied into value_out.