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#ifndef READ_POLYLINES_H
#define READ_POLYLINES_H
#include <cstddef>
#include <vector>
#include <fstream>
template <typename Point_3>
bool read_polylines(const std::string fname,
std::vector<std::vector<Point_3> >& polylines)
{
std::ifstream ifs(fname);
if(ifs.bad()) return false;
std::size_t n;
while(ifs >> n) {
polylines.resize(polylines.size()+1);
std::vector<Point_3>& polyline = polylines.back();
while(n-- != 0) {
Point_3 p;
ifs >> p;
if(ifs.fail()) return false;
polyline.push_back(p);
}
}
if(ifs.bad()) return false;
else return ifs.eof();
}
#endif // READ_POLYLINES_H
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