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suppose you have a random access iterator (eg of std::vector myVector)
when iter + someInt is past-end-iterator,
iter + someInt == myVector.end() ??
or could it be different value than myVector.end() ?
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Obviously if the iterator is advanced past the last element inside the loop the comparison in the for-loop statement will evaluate to false and the loop will happily continue into undefined behaviour.
In something like an std::vector the ::end() iterator will point to one past the last element. You can't dereference this iterator but you can compare it to another iterator. If you compare another iterator to end() you know you've reached the end of the container.
The list::end() is a built-in function in C++ STL which is used to get an iterator to past the last element. By past the last element it is meant that the iterator returned by the end() function return an iterator to an element which follows the last element in the list container.
To get the last element in an iterator loop you can use std::next() (from C++11). The loop is generally terminated by iterator != container. end() , where end() returns an iterator that points to the past-the-end element.
It's undefined behaviour, the standard says nothing about the result of that.
39
It's Undefined Behavior. Anything may happen. Just to name a few of the options: Nothing at all, program exits, exception, crash.
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