I have fairly decent C++ skills, but this one cast has been giving me issues. I have a function that takes in the following parameters: (volatile void **, void * , void*). I have 3 int* variables and I am trying to pass them in as (&var1, var2, var3). However, I am getting the following error: Cannot convert parameter 1 from int** to volatile void**. Is there a specific cast that needs to be made to allow for this? Below is a snippet of code that I am using. Any help is greatly appreciated.
int* pVal = InterlockedCompareExchangePointer(&cur_val, new_val, old_val);
This is being done in VS2010 on a windows XP machine.
The first one should be volatile void ** and you have int **. You can either just cast to volatile void**, or (better) declare the original variable as volatile and then cast.
volatile means that the variable can be changed elsewhere outside of your code, and basically it means that the variable won't be optimized, but since your original variable is not defined as volatile it might still be optimized, and you would get incorrect results.