array initialization requires a brace-enclosed initializer list lambda

Question

I'm new to lambda expression and little confused why I'm getting the error here?

#include <iostream>
#include <algorithm>    
using namespace std;    
int main()
{
    int arr[] = { 11, 21, 4, 13 };

    for_each(arr, arr + 4, [arr](int x) {
        cout << x;
    });
    return 0;
}

I just add LAMBDA for this function.

void fun1(int x)
    {
        cout << x << " ";
    }

Here is the error message on visual studio.

'main::<lambda_4ee0815d3a456ed46cc70a2a94c10f76>::arr': 
array initialization requires a brace-enclosed initializer list Project1

Answer 1

You cannot copy arrays, so you can capture arr by reference instead if you actually need it:

for_each(arr, arr + 4, [&arr](int x) { cout << x; });
//                     ^^^

However, since you don't refer to the array in the lambda body, you don't need to capture it at all:

for_each(arr, arr + 4, [](int x) { cout << x; });
//                    ^^^^