TickGuard

RAII helper that calls TickBarrier::complete() when leaving scope.

class TickGuard {
public:
  explicit TickGuard(TickBarrier& b); // stores pointer

  ~TickGuard();                       // barrier.complete()

  TickGuard(const TickGuard&)            = delete;
  TickGuard& operator=(const TickGuard&) = delete;
};

Purpose

• Ensure every PUSH subscriber thread signals the TickBarrier even if it exits early due to exceptions or return.

Usage

void listenerLoop(...) {
  TickGuard tg(barrier);        // marks this thread as part of the tick
  ...                            // process queue items
}                                // ~TickGuard → barrier.complete()

Notes

• Lightweight: stores only a TickBarrier*.
• Destructor is noexcept; guarantees completion call.