POD is as abbreviation on 'plain old data (type)'. A POD is also called 'a C-style struct' or an aggregate. A POD is a class without member function and private members.

Example


struct Pod

{

  int x;

  double y;

  bool z;

};



int main()

{

  Pod p;

  p.x = 1;

  p.y = 3.14;

  p.z = true;

}

Advice

Use PODs only when it really is just data and no invariant is meaningful for the data members [1]
Consider keeping the member variables public [2]

Bjarne Stroustrup. The C++ Programming Language (4th edition). 2013. ISBN: 978-0-321-56384-2. Chapter 16.4. Advice. page 479: '[3] Use public data (structs) only when it really is just data and no invariant is meaningful for the data members'
Herb Sutter, Andrei Alexandrescu. C++ coding standards: 101 rules, guidelines, and best practices. 2005. ISBN: 0-32-111358-6. Chapter 41: 'Make data members private, except in behaviourless aggregates (C-style structs).

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