Function SplitStringUsingChar

examples/nist.cc:165–183

using Matrix = Eigen::Matrix<double, Dynamic, Dynamic, RowMajor>;

void SplitStringUsingChar(const std::string& full,
                          const char delim,
                          std::vector<std::string>* result) {
  std::back_insert_iterator<std::vector<std::string>> it(*result);

  const char* p = full.data();
  const char* end = p + full.size();
  while (p != end) {
    if (*p == delim) {
      ++p;
    } else {
      const char* start = p;
      while (++p != end && *p != delim) {
        // Skip to the next occurrence of the delimiter.
      }
      *it++ = std::string(start, p - start);
    }
  }
}

bool GetAndSplitLine(std::ifstream& ifs, std::vector<std::string>* pieces) {
  pieces->clear();