c++ - gls library,Find the minimum distance between a point and a sets of points? -

how can find minimum distance between point (x0, y0) , sets of points {p0, ..., pn} gsl library in c++ ? have polygon containing sets of points {p0 (x0, y0), ..., p (xn, yn)} , point c (x0, y0), want calculate minimum distance between c , sets of points .

thanks

double min_dist = dbl_max; // large number point pointc; // set point want compare vector<point> pointlist; // push_back points (auto = pointlist.begin(); != pointlist.end(); ++it) {     point temppoint = *it;     // calculate distance between c , current point     double newdist = sqrt(pow((temppoint.x - pointc.x),2) + pow((temppoint.y - pointc.y),2))     // update min_dist if necessary     min_dist = min(min_dist, newdist) } 

using c++11 features, can written as

double min_dist = *std::min_element(begin(pointlist),                                     end(pointlist),                                     [pointc](const point& lhs, const point& rhs){ return std::hypot(lhs.x - pointc.x, lhs.y - pointc.y) < std::hypot(rhs.x - pointc.x, rhs.y - pointc.y); });