Applies unary + to the numerical value.
Declared in <mp-units/framework/quantity.h>
[[nodiscard]]
constexpr
QuantityOf<quantity_spec> auto
operator+() const
requires requires(const rep v) {
{ +v } -> std::common_with<rep>;
};
A quantity holding +numerical_value, in the same reference.
The return value should not be discarded.