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Comments on Is it undefined behaviour to just make a pointer point outside boundaries of an array without dereferencing it?
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Is it undefined behaviour to just make a pointer point outside boundaries of an array without dereferencing it?
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I have heard that it is undefined behaviour to make a pointer point outside boundaries of an array even without dereferencing it. Can that really be true? Consider this code:
int main(void)
{
char arr[10];
char *ptr = &arr[-1];
char c = *ptr;
}
The line char c = *ptr is obviously bad, because it's accessing out of bounds. But I heard something that even the second line char *ptr = &arr[-1] invokes undefined behaviour? Is this true? What does the standard say?
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