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Lambda Expressions in C++

Sandor Dargo on December 19, 2018

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lucasso profile image
Łukasz •

comment in the following example is wrong

[this](int value) {
  return 0 < value && value < this->m_upperBound; // doesn't compile, m_upperBound is not a non-static local
}

i guess it compiles

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Sandor Dargo •

You are right, I forgot to remove the comment there. Thanks a lot for spotting it!

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raghuram profile image
github_avenger • • Edited 
auto widgets = std::vector<Widget> { … }; // a bunch of widgets
for (auto& widget : widgets) {
  widgets.resize(); // Should this be widget.resize() ?? in both non-lambda and lambda ways
}
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Vishal Chovatiya •

Hey Sandor,

I had also written an article on Lambda expression covering basic to somewhat advance with simple & small illustrative examples here

Beginners will see "How Lambda expression synthesize by the compiler?" and for experienced programmers, you will see "There is a Lambda function returning another Lambda function"

I have also developed a Lambda mind map which is bonus material here.

Suggestion & Comments are most welcome.

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Pearson Daniels •

Great read! Any direction on resources for learning C or C++? This got me interested.

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Mark Boer •

That depends, I took a course that used this as course material. It is extensive, but it's no pleasant read.

If you know the syntax, but want to know best practices I can highly recommend the CPPCoreGuidelines by Bjarne (creator of the language) and Herb.

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Sandor Dargo •

That's a very good question which is difficult to answer.
Cppreference.com is not bad. I'd say take some tutorial and stick to it. That's not how I learnt so I cannot really recommend any but here is one.

Once you learnt the syntax and the basics, read some more advanced books, like Effective Modern C++ and follow some blogs, like Fluentcpp to learn about deeper topics.

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Scott Seager •

While maybe not the best site to learn C++, cppreference.com is a great place to consult when you need to know how to use a particular piece of standard functionality.

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raghuram profile image
github_avenger • • Edited

With using [&, divisor] as a capture, everything will be captured by value except for the variable that is explicitly listed.

Should that be captured by reference ??

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ranjithpp •

excellent read! thanks

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Sandor Dargo •

Thanks for your kind words!