[Valmont]

The function "fetch_block()" could be written differently. You'll need to check if this one is more efficient.

//fetch_block() assumes a block is:
// a) Starts with a double.
// b) After a double, it continues with unknown numbers of unsinged ints.
//End if newline or EOF is found.
void fetch_block(ifstream& ifs, double& time, vector<unsigned>& vec)
{
  unsigned val;
  char ch = ifs.peek();
  //Previous calls of this method leaves a newline behind. Test and remove if so.
  if(ch == '\n')
  {
    ifs.get(ch);
  }
  //We end up here if newline is removed/non-exist.
  //Fetch double from block if file is not empty.
  if( ifs>>time )
  {
    // "istream/ifstream >> variable" leaves a newline behind. Remove it.
    ifs.get(ch);
    //Now fetch the rest of the block if any unsigned is present.
    ch = ifs.peek();
    //Stop at next newline (or EOF obviously).
    //If there is a next newline, then that must be a second newline: our very
    //"block delimiter". We only want to fetch a single block!
    while(  ch != '\n' && ch != EOF )
    {
      ifs>>hex>>val;
      ifs.get(ch);
      vec.push_back(val);
      ch=ifs.peek();
    }
  }  
}