C++ return array without dynamic memory allocation?

I can't find a way to return an array without dynamic memory allocation. I will explain it in detail using an example:
With dynamic memory allocation:

Device* getConnectedDevices() {
    // scan for devices.
    Device *connectedDevices = new Device[deviceCount]; // Dynamically allocate memory for the Devices
    // Get for each device an ID
    return connectedDevices;
}
void doSomething() {
    // some code
    // I need a list with all the connected devices!!
    Device *connectedDevices;
    connectedDevices = getConnectedDevices();
    // do something with the array
}

doSomething() don't know the size of the array, so i used a struct to solve that problem:

struct deviceArray {
    Device* devices;
    int deviceCount;
};

Without dynamic memory allocation: I have no idea how to do this. I tried the following things:

• Pass by reference. Problem: we don't know the array size before scanning.
• Return without dynamic memory allocation (local variable) . Problem: the object no longer exist (of course).