cv::puttext character width?

edit

thx i do this like :

float xsize = cv::getTextSize("@", 1, 1, 1, 0).width;

for (int i = 0; i < txt.size(); i++)

{

    cv::putText(imgHSV, string(1, txt.at(i)), Point(i * xsize, 10 + (y * 1)), 1, 1, Scalar::all(0));

}

yes that's it but you can improve :

float xsize = cv::getTextSize("@", 1, 1, 1, 0).width;

for (int i = 0; i < txt.size(); i++)

{
     if (cv::getTextSize(string(1, txt.at(i)), 1, 1, 1, 0).width>xsize)
           xsize = cv::getTextSize(string(1, txt.at(i)), 1, 1, 1, 0).width;    
}
for (int i = 0; i < txt.size(); i++)
{
     cv::putText(imgHSV, string(1, txt.at(i)), Point(i * xsize, 10 + (y * 1)), 1, 1, Scalar::all(0));
}