Unit-Safe Physical Quantities

Medium C++ Validation Asked at Siemens

Solve this problem

Encode physical units in the type system so adding volts to amperes is a compile error, and dividing volts by amperes yields ohms.

Constraints

Template on integer exponents for voltage, current and time.
Addition and subtraction only between identical unit types.
Multiplication and division must add and subtract exponents.
All arithmetic constexpr.
No runtime overhead over a bare double.
Provide literal helpers for volts and amperes.

Starter codeC++

1template <int V, int A, int S>2struct Quantity {3    double value;4    // TODO5};