125
// GetAndDo returns the value corresponding to the key, and apply fn to key value before return value
126
// return (value, value exist or not, error when evaluation fn)
127
>
func (cmap *ShardedConcurrentTxMap) GetAndDo(key any, fn ActionFunc) (any, bool, error) {
concurrent_tx_map.go
128
>
shard := cmap.getShard(key)
129
>
var value any
130
>
var ok bool
131
>
var err error
132
>
shard.Lock()
133
>
if shard.items != nil {
134
value, ok = shard.items[key]
135
if ok {