Re: nullptr == p_one_past_last
"Earl Purple" <earlpurple@gmail.com> schrieb im Newsbeitrag
news:1155903520.290969.259430@75g2000cwc.googlegroups.com...
"Heinz Ozwirk" wrote:
A pointer to one past the last element cannot be 0. The standard already
says that (5.7/3) "if the expression Q points one past the last element
of
an array object, the expression (Q) - 1 points to the last element of the
array object". That would be impossible if all one past the end pointers
would be null pointers. But it wouldn't harm to explicitly state that a
one
past the end pointer cannot be a null pointer.
Suppose I implement an empty sequence with a null pointer. Then my
"one-past-the-end" will also be NULL because it will be the same as my
original pointer.
How do you get a pointer to an empty sequence? Unless you are talking of
iterators in the sense of the STL...
--
Matthias Hofmann
Anvil-Soft, CEO
http://www.anvil-soft.com - The Creators of Toilet Tycoon
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