/usr/lib/Wt/examples/treeview-dragdrop/CsvUtil.C is in witty-examples 3.1.10-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | #include <boost/tokenizer.hpp>
#include <boost/lexical_cast.hpp>
#include <Wt/WAbstractItemModel>
#include <Wt/WString>
#include "CsvUtil.h"
void readFromCsv(std::istream& f, Wt::WAbstractItemModel *model,
		 int numRows, bool firstLineIsHeaders)
{
  int csvRow = 0;
  while (f) {
    std::string line;
    getline(f, line);
    if (f) {
      typedef boost::tokenizer<boost::escaped_list_separator<char> >
	CsvTokenizer;
      CsvTokenizer tok(line);
      int col = 0;
      for (CsvTokenizer::iterator i = tok.begin();
	   i != tok.end(); ++i, ++col) {
	if (col >= model->columnCount())
	  model->insertColumns(model->columnCount(),
			       col + 1 - model->columnCount());
	if (firstLineIsHeaders && csvRow == 0)
	  model->setHeaderData(col, boost::any(Wt::WString::fromUTF8(*i)));
	else {
	  int dataRow = firstLineIsHeaders ? csvRow - 1 : csvRow;
	  if (numRows != -1 && dataRow >= numRows)
	    return;
	  if (dataRow >= model->rowCount())
	    model->insertRows(model->rowCount(),
			      dataRow + 1 - model->rowCount());
	  std::string s = *i;
	  boost::any data;
	  char *end;
	  int i = std::strtol(s.c_str(), &end, 10);
	  if (*end == 0)
	    data = boost::any(i);
	  else {
	    double d = std::strtod(s.c_str(), &end);
	    if (*end == 0)
	      data = boost::any(d);
	    else
	      data = boost::any(Wt::WString::fromUTF8(s));
	  }
	  model->setData(dataRow, col, data);
	}
      }
    }
    ++csvRow;
  }
}
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