Load the ratdb in root. .L RatDB.cc+ RatDB();

RatDB.cc

#include <RAT/DB.hh>
#include <RAT/Log.hh>

#include <iostream>
using namespace std;

void RatDB()
{

  RAT::Log::Init("/dev/null");

  RAT::DB* db = RAT::DB::Get();
  assert(db);

  char* glg4data = getenv("GLG4DATA");
  if (glg4data == static_cast<char*>(NULL)) {
    std::cerr << "ratzdab::ratdb: Environment variable $GLG4DATA must be set" << std::endl;
    assert(glg4data);
  }
  std::string data = std::string(glg4data);
  assert(data != "");
  db->LoadDefaults();

  cout << db->GetLink( "PMT", "r1408" )->GetS( "photocathode_surface" ) << endl;

}