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friend template decl. & impl. TVecHelpers.h 파일에는 아래와 같은 구현이 존재한다 TVecHelpers.h TVecAddOperators class 이고, TVec type이 이를 상속 받는다 private: /* * NOTE: the functions below ARE NOT member methods. They are friend functions * with they definition inlined with their declaration. This makes these * template functions available to the compiler when (and only when) this class * is instantiated, at which po..