[問題] 兩個class 彼此之間關係的問題
在A.cpp 這支file裡面定義了Class A
class A
{
....
};
如果在class A外面寫了一行 class B;
和在class A裡面寫了一行 class B;
分別的用意是什麼呢?
(class B實際定義寫在別的file裡頭)
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