删除一个对象两次？ [英] deleting an object twice?
问题描述
删除对象多次出现未定义的行为？我认为它不仅仅是确保...谢谢
Rick
Hi,
Does deleting an object more than one times incur undefined behavior? I
think it doesn''t but just making sure... thanks
Rick
推荐答案
Rick写道：
删除一个对象多次出现未定义的行为？
第一次删除会使指针无效。使用
无效指针调用未定义的行为。
我认为它不仅仅是确保...谢谢
Hi,
Does deleting an object more than one times incur undefined behavior?
The first delete renders the pointer to it invalid. Using an
invalid pointer invokes undefined behaviour.
I
think it doesn''t but just making sure... thanks
你错了。
-
Karl Heinz Buchegger
kb ****** @ gascad.at
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新闻：3f ******** @ clarion.carno.net.au ...
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news:3f********@clarion.carno.net.au...
删除对象多次出现未定义的行为？我认为它不仅仅是确保...谢谢
Rick
Hi,
Does deleting an object more than one times incur undefined behavior? I
think it doesn''t but just making sure... thanks
Rick
你是否正在设置指针第一次删除后为null？我想你
删除了一个空指针与两次删除指针混淆了。我不确定这是否是标准行为，但是在少数编译器上，
我使用删除检查空指针并且什么也没做。
Are you setting your pointer to null after the first delete? I think you
have deleting a null pointer mixed up with deleting a pointer twice. I am
not sure if this is a standard behavior or not but on the few compilers that
I have worked with delete checks for a null pointer and does nothing.
Rick写道：
Rick wrote:
删除对象多次出现未定义的行为？我认为它不仅仅是确保...谢谢
Rick
Hi,
Does deleting an object more than one times incur undefined behavior? I
think it doesn''t but just making sure... thanks
Rick
确实如此。删除会将指针呈现为无效，因此再次调用delete
将导致未定义的行为。要避免这种情况，只需在删除后将
指针设置为NULL即可。调用删除的NULL指针将无效。
-
Dipl.-Inform。 Hendrik Belitz
电子中心实验室
研究中心Juelich
It does. Delete renders a pointer to be invalid and so calling delete again
will result in undefined behaviour. To circumvent this, simply set the
pointer to NULL after deletion. Calling delete for a NULL pointer will do
nothing.
--
Dipl.-Inform. Hendrik Belitz
Central Laboratory of Electronics
Research Center Juelich
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