...ed gas by the amount of transactional data
if len(data) > 0 {
// Zero and non-zero bytes are priced differently
var nz uint64
for _, byt := range data {
if byt != 0 {
nz++
}
}
// Make sure we don't exceed uint64 for all data combinations
nonZeroGas = params.TxD...
...with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
...
...
```
/// This DB is a schematized RocksDB wrapper where all data passed in and out are typed according to
/// [`Schema`]s.
#[derive(Debug)]
pub struct DB {
inner: rocksdb::DB,
}
impl DB {
/// Reads single record by key.
pub fn get(&self, schema_key: &S::Key) -> Result { //从数据...
...的是，Kleinberg等人\[ [5](http://Jon Kleinberg, Sendhil Mullainathan, and Manish Raghavan. 2017. Inherent Trade-Offs in the Fair Determination of Risk Scores. In Proceedings of the 8th Innovations in Theoretical Computer Science Conference (ITCS ’17).)\]证明**没有机制能够**实现**最...