How to break nests? c-CodePudding

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;
    }

CodePudding user response：

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;
}

CodePudding user response：

If you want to break individual loop, then you can use break in their respect loop.

Putting too many or single break within a loop, will only break that loop that it is within it.


#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;
}