SyncedEnforcer And CachedEnforcer in c++

[phsang198]

Description

i don't know the different things between two type of them .
There are four problems which i want to solve in my server c++ :

1. load all policies from database to memory
2. cache some checked policies for after checking
3. auto reload any policies when having some changes in database
4. solve them in multi thread

Can you give me any examples for using ? Thank you !!!

[casbin-bot]

@EmperorYP7 @sheny1xuan @cs1137195420