How to Pass an Array into a Lambda Function in C++?

In C++, a lambda function, also known as a lambda expression, is a way of defining an anonymous function object right at the location where it is invoked or passed as an argument to a function. In this article, we will learn how to pass an array into a lambda function in C++.

Passing an Array into a Lambda Function in C++

To pass an array into a lambda function in C++, we can simply pass the array as an argument to the lambda function. Inside the lambda function, we can access the elements of the array just like we would in a regular function in C++.

Note: Remember to pass the size of the array as a parameter too.

C++ Program for Passing an Array into a Lambda Function

C++

// C++ Program to illustrate how to pass an array into a
// lambda function
#include <iostream>
using namespace std;

// Define a lambda function that takes an array as a
// parameter
auto printArray = [](int arr[], int size) {
    for (int i = 0; i < size; ++i) {
        cout << arr[i] << " ";
    }
    cout << endl;
};

int main()
{
    // Creating an array
    int arr[5] = { 1, 2, 3, 4, 5 };

    // Passing the array into the lambda function
    printArray(arr, 5);

    return 0;
}

Output

1 2 3 4 5 

Time complexity: O(N), where N is the number of elements in the array.
Auxiliary Space: O(1)

If the lambda expression is in the same scope as that of the array, we can also use the capture clause of the lambda expression to accesss the array inside it.