An iterator is an object with a next (Python 2) or __next__ (Python 3) method. Whenever you use a for loop, or map, or a list comprehension, etc. in Python, the next method is called …

Dec 6, 2017 · At the very first iteration, the iterator starts pointing to element with index 0? or like the "index -1" ? I ask because as far as I know the next() method returns the next element in …

Aug 27, 2010 · The reverse iterator is work for nothing, since the standard library provides a reverse-iterator adapter. And you failed to make the iterator type assignable from the const …

Feb 5, 2015 · What is the difference between iterators and generators? Some examples for when you would use each case would be helpful.

Iterator objects in python conform to the iterator protocol, which basically means they provide two methods: __iter__() and __next__(). The __iter__ returns the iterator object and is implicitly …

Oct 3, 2012 · In Java, I would prefer a for-each loop or use iterators. Pretty much same as C++ although slightly different syntax.

Oct 24, 2008 · So that's the iterator protocol, many objects implement this protocol: Built-in lists, dictionaries, tuples, sets, and files. User-defined classes that implement __iter__(). …

Essentially, there are only two ways to iterate over a list: by using an index or by using an iterator. The enhanced for loop is just a syntactic shortcut introduced in Java 5 to avoid the tedium of …

Jul 28, 2011 · Iterator is class that manages iteration over an Iterable. It maintains a state of where we are in the current iteration, and knows what the next element is and how to get it.

Feb 4, 2012 · won't work because end() returns a an iterator, and object is a pointer. Those are generally distinct types (A vector can use raw pointers as iterators, but not all implementations …