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Putting all the maintainability and reading issues aside, can these lines of code generate undefined behavior?
float a = 0, b = 0;
float& x = some_condition()? a : b;
x = 5;
cout << a << ", " << b;
No, it’s just fine. It would not create undefined behavior in this code. You will just change value of a or b to 5, according to condition.