Re: Non-null pointers in C/C++?

Angel Tsankov wrote:
....
> If you cast T const* to T*, pass the result to a function that takes T*,
and 
> that function changes the pointed-to value, do you get undefined
behaviour?

That depends upon whether or not the object pointed at was defined as 
const. The definition of the pointer is irrelevant, only the definition 
of the pointed-at object matters.

const int i=42;

void zeroint(int *pi)
{
     *pi = 0;
}

void const_zeroint(const int *cpi)
{
     zeroint((int*)cpi);
}

int main(void)
{
     int i=42;
     const int ci=6;
     const_zeroint(&i); // defined behavior
     const_zeroint(&ci); // undefined behavior
     return 0;
}
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