If there was a problem creating the BIO object, the pointer will be NULL.
如果创建BIO对象时遇到问题，指针将会是NULL。
A problem more serious than slicing the object may arise if we throw the pointer itself.
如果抛出指针本身，可能会引发比分割对象更严重的问题。
A problem more serious than slicing the object may arise if we throw the pointer itself.
如果抛出指针本身，可能会引发比分割对象更严重的问题。
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