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[英]how to forward declare a template class like template function in the same main file
[英]How to forward declare a function within the same class?
有一個 class A ,其中所有聲明和定義都放在里面,如下所示:
class A
{
void f(); // forward declaration for a lengthy method
...
void g()
{
f(); // call the above forward-declared method
}
void f() // definition of a lengthy method
{
...
}
}
我不想像 A::f() 那樣將 f() 從 class header 中取出,而只想將所有源代碼保留在 class 中。 但是,當我編譯它時,我收到以下錯誤:
error C2535: 'void A::f()': member function already defined or declared
note: see declaration of 'A::f'
難道沒有辦法解決這個問題嗎?
您不能,也不需要轉發聲明成員 function。
Member function definitions are in a "complete class context", which means that they have access to all members of the class, even those declared after the function body.
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