Data structure based on std::map to hold Argument and other value members with Sequencer::ArgumentID as the key, passing to/from asynchronous ProcessAsync() code. ArgumentData is pre-populated with input Argument values and other custom values can be added to the map in ServiceBlock::ProcessEvent() function. Any data that is left in the ArgumentData map after ServiceBlock::ProcessEmit() function will be assigned back to the source data member before emitting the output event if any.

std::map<ArgumentID, CDP::StudioAPI::CDPVariantValue>