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📜 WAYPOINT LESSON

Checkpoint: Copy & Move

⭐⭐ intermediate⏳ 35 min read📍 Lesson 91 of 204

One owning type with correct copy independence and a safe move — the Rule of Five in miniature.

Write Sentence with the full ownership discipline:

  • one std::vector member means the compiler-generated copies are already deep — but write the five operations yourself to see the machinery
  • joined() builds its string from words; no stored separator state
  • after std::move(a), a must still be destructible (it will be — the vector member handles it) while c owns the words

If your copy tests pass but assignment leaks or double-frees, you have re-discovered why the Rule of Three exists.