According to ISO C++, dereferencing a null pointer is undefined behaviou. My curiosity is, why? Why has the standard decided to declare it undefined behavior? What is the rationale behind this decision? Compiler dependency? Doesn't seem, because according to C99 standard, as far as I know, ...
Your question states that you want to execute the if block if either pointer is NULL or points to '\0', so you really want this: // mplate is a reference to a class if (mplate.m_plate == nullptr || mplate.m_plate[0] == '\0' || plate == nullptr || plate[0]...
An allocation fails. Subsequent cleanup code, typically in a distant part of the function, references the NULL pointer while cleaning up from a more likely error. A pointer and the pointed-to data are both checked for NULL correctly, but a debug/warning message that is printed uses the point...
After a lot of reading, I have concluded that I am dereferencing a Null Pointer and then trying to use it after this. However, nowhere in my code do I overtly set a pointer to 0 or NULL. I've read that return values from methods (particularly if using "if" statements) can set poi...
Before you derefrence a pointer, you could check if it is a null pointer with something like: if (myPointer != nullptr) /*do something with it*/ ; That should help you avoid the problem and hopefully locate it so that you can prevent trying to use a nullpointer. ...
void f(bool b) { int Arr[4] = {}; int* PArr[4] = {}; for (int i = 0; i < g(b); ++i) PArr[i] = &Arr[i]; for (int j = 0; j < g(b); ++j) *PArr[j] = 5; } results in Source.cpp(11): warning C6011: Dereferencing NULL pointer 'PArr[j]'. ...
dll in a c++ project Additional lib path in VC++ Directories or in Linker -> General AfxGetThread() returns NULL pointer to pThread in winmain.cpp afxwin1.inl ASSERT error in AfxGetResourceHandle() already defined in .obj Alternative for strptime() AlwaysCreate -> unsuccessfulbuild ambiguous ...
Compiling this simple TU: voiddo_stuff();int*ptr;intf(){while(!ptr)// Line 6do_stuff();// Line 7return*ptr;// Line 8} with “cl /nologo /Zs /analyze” diagnoses: repro.cpp(8) : warning C6011: Dereferencing NULL pointer 'ptr'. : Lines: 6, 7, 6, 7, 6, 8 ...
applying fixups BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffffa051ab3c>] dmp_get_dmpsymbols+0x1c/0x1a0 [dmpCLARiiON] PGD 82935c067 PUD 82a53f067 PMD 0 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/system/cpu/cpu31/cache/index2/shared_cpu_...
I have unintentionally raised a large debate recently concerning the question if it is legal in C/C++ to use the &P->m_foo expression with P being a null pointer. The programmers' community divided into two camps. The first claimed with confidence that it wasn't legal while the others ...