crypto: avoid std::function
Using a template type lets the compiler choose an appropriate type that likely is more efficient than std::function since the lambda expressions at the call sites do not capture any values from surrounding scopes.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Using a template type lets the compiler choose an appropriate type that likely is more efficient than std::function since the lambda expressions at the call sites do not capture any values from surrounding scopes.