opencv: Rotate image by 90, 180 or 270 degrees

opencv2:

void
    rotate_cw(const cv::Mat& image, cv::Mat& dest, int degrees)
    {
        switch (degrees % 360) {
            case 0:
                dest = image.clone();
                break;
            case 90:
                cv::flip(image.t(), dest, 1);
                break;
            case 180:
                cv::flip(image, dest, -1);
                break;
            case 270:
                cv::flip(image.t(), dest, 0);
                break;
            default:
                cv::Mat r = cv::getRotationMatrix2D({image.cols/2.0F, image.rows/2.0F}, degrees, 1.0);
                int len = std::max(image.cols, image.rows);
                cv::warpAffine(image, dest, r, cv::Size(len, len));
                break; //image size will change
        }
    }

opencv3:

void cv::rotate(InputArray src,
        OutputArray dst,
        int rotateCode 
    )        

Rotates a 2D array in multiples of 90 degrees. The function rotate rotates the array in one of three different ways: Rotate by 90 degrees clockwise (rotateCode = ROTATE_90). Rotate by 180 degrees clockwise (rotateCode = ROTATE_180). Rotate by 270 degrees clockwise (rotateCode = ROTATE_270).

Core.rotate(Mat src, Mat dst, Core.ROTATE_90_CLOCKWISE); //ROTATE_180 or ROTATE_90_COUNTERCLOCKWISE