If and Switch local scoped variables

There is an interesting new feature that allows you to declare a local variable bound to the if and switch statements' block of code. The scope of the variable used in the if and switch statements will go out of scope outside the respective blocks. It can be better understood with an easy to understand example, as follows:

#include <iostream>
using namespace std;

bool isGoodToProceed( ) {
    return true;
}

bool isGood( ) {
     return true;
}

void functionWithSwitchStatement( ) {

     switch ( auto status = isGood( ) ) {
          case true:
                 cout << "\nAll good!" << endl;
          break;

          case false:
                 cout << "\nSomething gone bad" << endl;
          break;
     } 

}

int main ( ) {

    if ( auto flag = isGoodToProceed( ) ) {
         cout << "flag is a local variable and it loses its scope outside the if block" << endl;
    }
    
     functionWithSwitchStatement();

     return 0;
}

The preceding code can be compiled and the output can be viewed with the following commands:

g++-7 main.cpp -std=c++17
./a.out

The output of the preceding program is as follows:

flag is a local variable and it loses its scope outside the if block
All good!