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15.5 unique_ptr return
์ move ๊ฐ๋ ์ด๋ค์. ์๋ชป ์ดํดํ์ต๋๋ค. ๊ทธ๋ฐ๋ฐ doSometing2์์ return ํ ๋ res๋ฅผ std::move(res)์ํ๊ณ returnํด๋ ์๊ด ์๋์?
