According to http://doc.qt.io/qt-5/qpointer.html, QPointer is very useful. But I found it could be inefficient in the following context:
I am writing an expression-parsing library. It is written with Qt, a开发者_开发问答nd I have a class structure like this:
According to SGI\'s doc on associative containers, \"Since elements are stored according to their keys, it is essential that the key associated with each element is immutable\". I sometimes use a poin
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