Embedded C++ support in Digi ESP

Hello Digi ESP experts,

I am newbie using Digi ESP over Connect ME module and was curious to know about C++ support in ESP compilation environment.

Is there a document describing the C++ options supported by Digi ESP GNU tool chain? Is it a real EC++ compiler (a stripped down subset of full C++)?

Is this suitable for a UML based application development in embedded environment?

If any of you have some comments about memory requirement/ performance impact due to C++, please do share your experiences.

Thanks for your support.