Test: iterator_invalidation.cpp
iterator_invalidation.cpp:34:10: error: 'vector' in namespace 'std' does not name a template type
   34 |     std::vector<std::string> events_;
      |          ^~~~~~
iterator_invalidation.cpp:2:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    1 | #include <iostream>
  +++ |+#include <vector>
    2 | #include <string>
iterator_invalidation.cpp: In member function 'void EventQueue::addEvent(const std::string&)':
iterator_invalidation.cpp:8:9: error: 'events_' was not declared in this scope; did you mean 'event'?
    8 |         events_.push_back(event);
      |         ^~~~~~~
      |         event
iterator_invalidation.cpp: In member function 'void EventQueue::processEvents()':
iterator_invalidation.cpp:14:24: error: 'events_' was not declared in this scope
   14 |         for (auto it = events_.begin(); it != events_.end(); ++it) {
      |                        ^~~~~~~
iterator_invalidation.cpp: In member function 'int EventQueue::getEventCount() const':
iterator_invalidation.cpp:30:16: error: 'events_' was not declared in this scope
   30 |         return events_.size();
      |                ^~~~~~~