how to use function variables inside a lambda in C++

Asked May 11 '22 at 16:29

Active May 11 '22 at 16:29

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Here in C++, i want to use a variable invalidNumber which is already available in a function scope inside the lambda. There was a compiler error when i tried the below code. How to make Lambda function to use it's surrounding variables in the scope where it's been defined.

void func()
{
    set<int> intSet{10,20,30,40};
    int invalidNumber = 100;            
    intSet.erase(std::remove_if(intSet, [](int comp) { return comp == 0 || comp == invalidNumber; }), intSet.end());
}

asked May 11 '22 at 16:29

ShIvA SaI

1

You need to capture that variable: `[invalidNumber]`. – Victor Eijkhout May 11 '22 at 16:31
1

You can specify it in the capture sequence. See the [documentation](https://en.cppreference.com/w/cpp/language/lambda) – Lala5th May 11 '22 at 16:31

how to use function variables inside a lambda in C++

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