Modify observer_set
to only accept and pass const ref arguments
#4768
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This avoids copying parameters when notifying observers.
It's the first part of the refactoring, the second will be dropping redundant
const &
qualifications from observer set events, eg:nano::observer_set<processed_batch_t const &> batch_processed;
to justnano::observer_set<processed_batch_t> batch_processed;
should be fine now, the batch will be passed by reference by default. I'll do this refactoring after bounded backlog changes as it will mess a lot of existing commits.