Read the whole content of a text file and return C++ std::vector

read_ascii.h

#include <iostream>
#include <fstream>
#include <vector>
template <typename T>
std::vector<T> read_ascii(std::string fname, bool verbose = false)
{
  std::vector<T> data;
  std::ifstream ifs (fname);
  T buf;
  if (ifs.is_open())
  {
    while (ifs >> buf)
    {
      data.push_back(buf);
    }
  }
  if (verbose)
  {
    for (int j = 0; j < data.size(); j++)
    {
      std::cout << "data(" << j << ") = " << data[j] << std::endl;
    }
  }
  ifs.close();
  return data;
}