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explicit(bool)
조건부 explicit
예전
생성자에서 암시적
형 변환이 되는데
이것을 부분적으로
제한하기가 쉽지
않았다
C++ 20
explicit (bool) 구문이 true 일 경우
explicit 명령어가 동작한다

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C++20 explicit(bool)