Method operator-

src/fl/stl/chrono.h:160–162

Subtract two time_points to get a duration

    /// Subtract two time_points to get a duration
    constexpr Duration operator-(const time_point& rhs) const FL_NOEXCEPT {
        return Duration(mDuration.count() - rhs.mDuration.count());
    }

    /// Add a duration to a time_point
    constexpr time_point operator+(const Duration& d) const FL_NOEXCEPT {