What happens to an address after delete operator has been applied to it in C++?

Question

If I delete a pointer as follows for example:

delete myPointer;

And, after that did not assign 0

Answer 1

This question is important! I have seen that Visual Studio 2017 has changed pointer value after "delete". It coused a problem because I has using memory tracing tool. The tool was collecting pointers after each operator "new" and was checking them after "delete". Pseudo code:

Data* New(const size_t count)
{
    Data* const ptr(new Data[count]);
    #ifdef TEST_MODE
    MemoryDebug.CollectPointer(ptr);
    #endif
    return ptr;
}

void Delete(Data* const ptr)
{
    delete[] ptr;
    #ifdef TEST_MODE
    MemoryDebug.CheckPointer(ptr);
    #endif
}

This code works good on Visual Studio 2008 but was failing on Visual Studio 2017 so I have changed the order of operations in second function.

However the question is good and the problem exists. Experienced engineers should be aware of that.