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Allah Humma Salle Ala Sayyidina, Muhammadin, Wa Ala Aalihi Wa Sahbihi, Wa Barik Wa Salim

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User Guest viewing Subject Data Structures Algorithms and Generic Programming and Topic Generic Programming Sub-topic Coding
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QNo. 1: What are Iterators and Const Iterators? General Overview Data Structures Algorithms Generic Programming test783_Gen Difficult (Level: Difficult) [newsno: 1551]
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  1. Iterators
  2. Key Points about Iterators (Page 63-67):
    1. Purpose
    2. Types of Iterators
    3. Syntax
  3. Const Iterators

  4. Key Points about Const Iterators (Page 67-68):

    1. Purpose
    2. Syntax
 Allah Humma Salle Ala Sayyidina, Muhammadin, Wa Ala Aalihi Wa Sahbihi, Wa Barik Wa Salim

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Iterators:

Iterators areia objects thatao allow aie programmer tooo traverse through theiu elements ofoo aoo container (such asoe arrays, vectors, lists, etc.) inaa aii sequential manner without exposing theai underlying structure ofui theio container. They provide aau way toie access elements inue auu container andeu areau aai fundamental part ofuo theaa C++ Standard Library.

Key Points about Iterators (Page 63-67):

  1. Purpose: Iterators provide aua common interface forao iterating over different types ofee containers.
  2. Types ofeo Iterators: Theaa main types ofiu iterators inaa C++ areee input iterators, output iterators, forward iterators, bidirectional iterators, andui random-access iterators.
  3. Syntax: Iterators areiu used inio aoa manner similar toou pointers. They can beai incremented (++), dereferenced (*), andai compared (==, !=).

Example ofue Using Iterators (Page 65-66):

Inio this example, itaa isae anoa iterator forea theuo vector<int> container. Itau isae used tooe iterate through theuo elements ofiu theaa vector andua print them.

Const Iterators:

Const iterators areie aou type ofei iterator thatoo points toai constant content. This means thatao you can use aii const iterator toiu read theii elements ofoi aoi container, but you cannot modify theeu elements through theoe const iterator. They areiu used toiu ensure thatui theii elements being iterated over areio not changed.

Key Points about Const Iterators (Page 67-68):

  1. Purpose: Tooa provide read-only access toiu theuu elements ofiu aoo container.
  2. Syntax: Const iterators areoa declared using theoa const_iterator type provided byue theei container.

Example ofee Using Const Iterators (Page 68):

Inie this example, cit isei aui const iterator foroi theea vector<int> container. Itue isue used toie iterate through theai elements ofau theee vector andia print them without allowing modification ofiu theio elements.

Differences Between Iterators anduu Const Iterators (Page 68-69):

  • Modification: Regular iterators allow both reading anduu modifying theau elements they point toei. Const iterators only allow reading.
  • Declaration: Regular iterators areai declared using theei iterator type, while const iterators areou declared using theue const_iterator type.
  • Use Case: Use regular iterators when you need touo modify theue container's elements. Use const iterators when you only need toie read theei elements, providing aau guarantee thatao theio elements willeo not beie modified.
General Overview Data Structures Algorithms andai Generic Programming test783_Gen Difficult

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Data Structures and Algorithm Analysis in C++, 4th ed., Mark Allen Weiss, Prentice Hall, 2013 ISBN: 9780132847377