Method operation

src/include/function/arithmetic/abs.h:14–20

struct Abs {
    template<class T>
    static inline void operation(T& input, T& result) {
        if constexpr (common::UnsignedIntegerTypes<T>) {
            result = input;
        } else {
            result = std::abs(input);
        }
    }
};

template<>