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C set pointer to null




c set pointer to null

What is that assert doing there then?
Apr 10 '06 # 30 P: n/a Old Wolf Phlip wrote: Noah null Roberts wrote: p getPointerFromWhatever if (p) p- method(42 p getPointerFromWhatever assert(p p- method(42 The code is one tick simpler; it has one less 'if' statement.
Not all, only the functions that need to be instrumented.If you pass a pointer by value you can't exactly effect anything by setting that value to 0 on the other e original copy of the pointer is unchanged.Nullptr in C11, to address the above issues, C11 pointer introduces null a new keyword null called nullptr.Apr 10 '06 # 2, p: n/a lters, joe Van Dyk wrote: When you delete a pointer, you should set it to null, right?I can't parse it and it doesn't seem to apply to the question at all.A pointer that is assigned pointer null is called a null pointer.There's more reasons than smart null pointers.You didn't make "all member functions polymorphic".Not quite a pattern.Also notice that the reset will not always pointer prevent the error.



It is not always helpful.
Doesn't hurt and is often helpful.
Avoid this mistake: char *ptr; if(ptr null) /This will return false.
I don't think a toshiba smart pointer can help me there.
Apr 12 '06 # 49 P: n/a Kai-Uwe Bux Default User wrote: Phlip wrote: Paul.The book Design Patterns calls this topic "program to the guide interface".In those cases you should null it when deleting.Apr 10 '06 # 18 P: n/a Noah Roberts Phlip wrote: Noah Roberts wrote: p getPointerFromWhatever assert(p p- method(42 The code is one tick simpler; it has one less 'if' statement.It is not increasing the mental burden of reading the function.The value of ptr.Sounds like you're deleting something twice.0) delete ptr; / null-check not needed Which spread allows you to write code like this (no endorsements manual made Foo *foo 0; : : if (allocFoo) foo new Foo; : : if (deleteFoo) delete foo; foo 0; : : delete foo; The code above is not.(Before you go manual searching the dozens of plop books for it, that would be an "argument by authority" that misses my point.) If you were to invent a complete object model from scratch, it should minimize pointers, minimize 'if' checks on pointers, and not use.But ecosport even if a null pointer is represented as 0xdeadbeef, 0 or (void 0 is still a null pointer constant.Apr 10 '06 # 15 P: n/a Phlip andrew queisser wrote: I'm a little surprised koss at the responses you've been getting from some very experienced programmers.Unless a value is assigned, a pointer will point to some garbage address by default.No other access can be solved in this manner beyond the fact that you can now check garlic the pointer's value before accessing.





(Before you c set pointer to null go searching the dozens of plop books for it, that would be an "argument by authority" that misses my point.) If you want to go that route you'll have to quantify how to call something a pattern.
This can cause a major headache.
Apr 10 '06 # 33 P: n/a Noah Roberts Ian Collins wrote: Potentially dangerous without an else?

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