What is an STL iterator?

Iterators are used to point at the memory addresses of STL containers. They are primarily used in sequence of numbers, characters etc. They reduce the complexity and execution time of program.

Which of the following are the STL iterators?

STL Iterators

  • Input Iterators.
  • Output Iterator.
  • Forward Iterator.
  • Bidirectional Iterator.
  • Random Access Iterator.

What does an iterator do?

The primary purpose of an iterator is to allow a user to process every element of a container while isolating the user from the internal structure of the container. This allows the container to store elements in any manner it wishes while allowing the user to treat it as if it were a simple sequence or list.

How do you define an iterator?

Iterators are used to traverse from one element to another element, a process is known as iterating through the container. The main advantage of an iterator is to provide a common interface for all the containers type. Iterators make the algorithm independent of the type of the container used.

Is forward iterator?

A Forward Iterator is an iterator that corresponds to the usual intuitive notion of a linear sequence of values. It is possible to use Forward Iterators (unlike Input Iterators and Output Iterators) in multipass algorithms.

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What are the types of STL containers?

The three types of containers found in the STL are sequential, associative and unordered.

Unordered (associative) Containers

  • unordered_set.
  • unordered_multiset.
  • unordered_map.
  • unordered_multimap.

What is iterator in Java?

Iterator in Java. In Java, an Iterator is one of the Java cursors. Java Iterator is an interface that is practiced in order to iterate over a collection of Java object components entirety one by one. … The Java Iterator also helps in the operations like READ and REMOVE.

What is the difference between iterator and pointer?

A pointer hold an address in memory. An iterator may hold a pointer, but it may be something much more complex. … A pointer of type T* can point to any type T object. An iterator is more restricted, e.g., a vector::iterator can only refer to doubles that are inside a vector container.

Which header file is used for iterator in C++?

Why is this the case since these functions are defined in the <iterator> header? The only header I used is <iostream> .

What Iterator can throw a ConcurrentModificationException?

Fail-Fast iterators immediately throw ConcurrentModificationException if there is structural modification of the collection. Structural modification means adding, removing any element from collection while a thread is iterating over that collection.

Why is Iterator better than for loop?

Iterator and for-each loop are faster than simple for loop for collections with no random access, while in collections which allows random access there is no performance change with for-each loop/for loop/iterator.

Can Iterator traverse a collection in both directions?

Iterator can traverse only in forward direction whereas ListIterator traverses both in forward and backward directions. ListIterator can help to replace an element whereas Iterator cannot.

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