Add "empty" support to standard containers.
Add "empty" support to standard containers.


kamilzubair/ChaiScript,bradparks/ChaiScript__cplusplus_scripting_language,lefticus/ChaiScript,lefticus/ChaiScript,lefticus/ChaiScript,kamilzubair/ChaiScript,bradparks/ChaiScript__cplusplus_scripting_language,kamilzubair/ChaiScript,bradparks/ChaiScript__cplusplus_scripting_language