Function operator-

include/Quaternion.hpp:109–109

* Subtract two quaternions. */

     * Subtract two quaternions.
     */
    Quaternion operator-(const ::Quaternion& quaternion) const { return ::QuaternionSubtract(*this, quaternion); }

    Quaternion& operator-=(const ::Quaternion& quaternion) {
        set(::QuaternionSubtract(*this, quaternion));