module std::core::string::iterator;

struct StringIterator
{
	String utf8;
	usz current;
}

fn void StringIterator.reset(&self)
{
	self.current = 0;
}

fn Char32! StringIterator.next(&self)
{
	usz len = self.utf8.len;
	usz current = self.current;
	if (current >= len) return IteratorResult.NO_MORE_ELEMENT?;
	usz read = (len - current < 4 ? len - current : 4);
	Char32 res = conv::utf8_to_char32(&self.utf8[current], &read)!;
	self.current += read;
	return res;
}