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Challenge on lesson: Checkpoint: RAII

CHALLENGE

Difficulty: beginner+25 XP

Implement class IntBox: constructor explicit IntBox(int value) stores a heap int (using new — the one sanctioned place), get() const returns the value, destructor frees it. Deleting copy construction/assignment is required. Then implement make_doubled(int) returning std::unique_ptr<IntBox> holding the doubled value.

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