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Getting the Correct Iterator

outer.iterator will always give you a new iterator. You need to create one and stash it somewhere, then use that single stashed one rather than creating a new one every time:

new Iterator[A] {
  val outerIterator = outer.iterator
  override def hasNext = ...

Categories : Scala

Related to : Getting the Correct Iterator
testing over an iterator, how to do it?
You're approaching the test incorrectly. Your iterator is basically the equivalent of xrange hardcoded to start from 2 and goes to infinity. The reason it starts from 2 is because you're initialising i to 1 and incrementing i inside the next before returning the first value. I would write the test as follows class TestA(unittest.TestCase): def test_loop_is_sliceable(self): slc = it

Categories : Python
Using JAVA Iterator
You're not using the iterator to iterate through your correction, and so you cannot use it to remove elements. To use it correctly, you must loop with the iterator itself. i.e., for (Iterator<E> iter = list.iterator(); iter.hasNext(); ) { E element =; // 1 - can call methods of element // 2 - can use iter.remove() to remove the current element from the list //

Categories : Java
Is there any way to skip the first node while using an iterator?
There are several ways to skip the first element of the iterator. For example : boolean first = true; for(Iterator <Vertex> it = adjList[i].iterator(); it.hasNext();) { if (first) { // skip first; first = false; } else { // handle the rest } }

Categories : Java
`iterator` and `const_iterator` for C arrays in C++?
You may use standard functions std::begin, std::end, std::cbegin, std::cend declared in header <iterator> with arrays and standard containers. Here is a demonstrative program #include <iostream> #include <iterator> #include <vector> template <typename Container> auto f( const Container &c ) ->decltype( std::begin( c ) ) { for ( auto it = std::begin( c );

Categories : C++
Use of std::regex_iterator according to
What do you mean with "if rend is never initialized"? Clearly, std::regex_iterator<I> has a default constructor. Since the iteration is only forward iteration the end iterator just needs to be something suitable to detect that the end is used. The default constructor can set up rend correspondingly. This is an idiom used in a few other places in the standard C++ library, e.g., for std::istr

Categories : C++
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