Got unexpected event when use envent like "ev_start"_e rather than ev_start{} while use boost::sml as a class member

[SdKay]

Expected Behavior

right state transfer

Actual Behavior

unexpected event error

Steps to Reproduce the Problem

I use demo in https://github.com/ubeh/fsm_examples/tree/master/sml_refactored when i change event from ev_start{} to "ev_start"_e both in fsm_impl.h and controller.cpp, the state cannot be transferred corretly

Specifications

• Version: latset
• Platform: Ubuntu18.04
• Subsystem: