$ make
$ ./a.out 
Compiling plugin ... done
Loading package base ... linking ... done
Loading objects API Plugin ... done
> ?
"?"
"quit"
"clear"
"filter foo"
> filter adf adsf
fsda fda
> filter asd faSDFADSF
FSDAFDSaf dsa

-- at this point I edit the plugin and save the source

> filter asfdaSDFASD
Compiling plugin ... done
Reloading Plugin ... done
DSAFDSADFSA

-- it compiled and reloaded it for me. nice.