Effective Analysis Programming Part 2

C++ Templates

exercise 2: read paramerters

The library readparamertes can be used to read values from a text file like:

# GKS 2013
answer 42
parser_test "\\\"" "#" #should result in \" and #
useful yes

The following code is an example how to use readparameters:

#define MAIN_CPP

#include <iostream>
#include <exception>
#include "readparameters.h"

using namespace std;

int main(int argc,char **argv){ 
  //check arguments
  if (argc!=2) {
    cerr<<"Usage: ./params <paramfile>"<<endl;
    return 1;
  } 
  
  //get input filename from parameter file
  int answer;
  vector<string> v;
  try { 
      readparameters rp(argv[1]);
      answer = rp.get<int>("answer");
      v=rp.get_vector<string>("parser_test");
      cout<<answer<<endl;
      rp.print_tabular(); //debug output
      rp.get<long>("Atlantis"); //exception
      
  }
  catch (exception& e) {
      cerr<<e.what()<<endl;
      return 1;
  }

  return 0;
}

• Run the code, add more parameters to the text file, read a boolean parameter.
• Read the code of the class readparamerters (you may skip the parsing part in the constructor).
  • get and get_vector are template functions. Why are there specializations for bool and string?
  • Why is the map tabular mutual?
  • What are the requirements for types to work with readparameters?
  • Why is the default constructor privat?