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📜 WAYPOINT LESSON

Checkpoint: Ownership Transfer

⭐⭐ intermediate⏳ 35 min read📍 Lesson 111 of 204

An Inventory whose take() moves a unique_ptr out of a vector — the exact mechanics of ownership leaving a container.

take() is the exam because it is the precise dance ownership teaches:

  1. find the slot by name
  2. auto out = std::move(*it); — ownership leaves the vector; the slot now holds an empty unique_ptr
  3. items_.erase(it); — remove the empty husk
  4. return out

Skipping step 2 destroys the item; skipping step 3 leaves a nullptr hole in the container. Both mistakes are silent at compile time — which is why the tests check size, identity, and containment after the call.

This is the same dance std::vector::erase-with-move, node removal in linked structures, and job queues all perform. Learn it once here and you will recognize it everywhere.