157. Polymorphism-ii

Question.2

A function takes a base object by value:

void process(SensorBase s) {  // By value!
   int v = s.read();
}

TempSensor temp;
process(temp);  // Pass derived by value

What happens?

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TempSensor::read() is called via polymorphism
Compilation error -- cannot pass derived to base parameter
TempSensor is moved into the function
Object slicing -- only the SensorBase portion is copied; virtual dispatch is lost; SensorBase::read() is called (or pure virtual crash if abstract)

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