Compiler Warning (level 1) C4319 (Windows CE 5.0)
'operator' : zero extending 'type' to 'type' of greater size
The result of the ~ operator is unsigned and then converted to a larger type.
In the following example, ~(a - 1) is evaluated as a 32-bit unsigned long expression and then converted to 64 bits by zero extension. This leads to pointer truncations.
void* p;
unsigned long a;
typedef unsigned __int64 ULONG_PTR;
void main()
{
p = (void*)((ULONG_PTR)p & ~(a - 1));
}
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