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Possible Duplicate:
Testing pointers for validity (C/C++)
If I have a pointer, like char* foo, is there any way to determine if foo points to a valid location in memory? (So, foo is not NULL, and delete has not yet been called on it.)
502
No, there is not.
95
No. It's pretty much your responsibility to make sure you don't use dangling pointers.
However, one practice recommended by that link (I've seen some people use this, others hate it) is to immediately set the pointer to NULL after you free/delete it.
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