Using Lambdas in C++: Listing 4

Printing odd elements from Listing 3, using lambda expressions.

int main()
  // a list of 20 integers
  list<int> l(20);

  // here's the lambda version of GenerateFibonacci::operator()() in Listing 3.
  // I replaced private variables penultimate_ and last_ with static ones, so they maintain
  // values between consecutive invocations.
  generate(begin(l), end(l), [] () {
    static int penultimate(0), last(1);
    int current = penultimate + last;

    penultimate = last;

    return last = current;

  // likewise, we do the same with Listing 3 function printIfOdd(int).
  for_each(begin(l), end(l), [] (int n) {
  if (n%2)
    cout << n << " is odd." << endl;

  return 0;

About the Author

Diego Dagum is a software architect and developer with more than 20 years of experience. He can be reached at [email protected]

comments powered by Disqus


  • Death of the Dev Machine?

    Here's a takeaway from this week's Ignite 2020 event: An advanced Azure cloud portends the death of the traditional, high-powered dev machine packed with computing, memory and storage components.

  • COVID-19 Is Ignite 2020's Elephant in the Room: 'Frankly, It Sucks'

    As in all things of our new reality, there was no escaping the drastic changes in routine caused by the COVID-19 pandemic during Microsoft's big Ignite 2020 developer/IT pro conference, this week shifted to an online-only event after drawing tens of thousands of in-person attendees in years past.

  • Visual Studio 2019 v16.8 Preview Update Adds Codespaces

    To coincide with the Microsoft Ignite 2020 IT pro/developer event, the Visual Studio dev team shipped a new update, Visual Studio 2019 v16.8 Preview 3.1, with the main attraction being support for cloud-hosted Codespaces, now in a limited beta.

  • Speed Lines Graphic

    New for Blazor: Azure Static Web Apps Support

    With Blazor taking the .NET web development world by storm, one of the first announcements during Microsoft's Ignite 2020 developer/IT event was its new support in Azure Static Web Apps.

  • Entity Framework Core 5 RC1 Is Feature Complete, Ready for Production

    The first release candidate for Entity Framework 5 -- Microsoft's object-database mapper for .NET -- has shipped with a go live license, ready for production.

Upcoming Events