28. Smart pointers

目的是利用 stack-based 物件離開有效範圍時會自動呼叫 destructor 的特性來完成自動刪除記憶體。設計上會有幾個問題需要考慮。

可以，但是控制權會轉移，考慮以下程式碼。

Add implicit conversion to void* , all the condition above is ok.

But it comes to another problem.

Try another way.

It works under some condition but still have problem.

Add implict conversion.

但付出的代價就是使用者直接操作 pointer，這跟設計 smart pointer 的理念就背道而馳。

儘管可以隱式轉換為 pointer，有些情況 smart pointer 還是沒辦法跟 pointer 直接互換。

因為對於 compiler 來說SmartPtr<A> 跟 SmartPtr<B> 是兩個沒什麼關係的類別。可以這樣子解決。

大概類似下面的實作，將 copy constructor & assignment operator 刪除確實少了很多彈性，但同時也少了很多問題。

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