How to break out of a nested loop?

Question

Is there any way to break this without if/else conditionals for each layer?

#include <iostream>

using namespace std;

int main()
{
    for (int i = 0; i < 20; i++)
    {
        while (true) 
        { 
            while (true) 
            { 
                break; break; break; 
            } 
        }
    }
    
    cout << "END";

    return 0;
}

Answer 1

You can wrap the logic in a function or lambda.

Instead of break; break; break; (which won't work) you can return;.

#include <iostream>
using namespace std;
int main()
{
    auto nested_loops = []
    {
        for (int i = 0; i < 20; i++)
        {
            while (true) 
            { 
                while (true) 
                { 
                    // Done with all the looping
                    return;
                } 
            }
        }
    };

    nested_loops();
    cout << "END";
    return 0;
}

Or (same effect, different style)

#include <iostream>
using namespace std;
int main()
{
    [] {
        for (int i = 0; i < 20; i++)
        {
            while (true) 
            { 
                while (true) 
                { 
                    // Done with all the looping
                    return;
                } 
            }
        }
    } ();

    cout << "END";
    return 0;
}