indexedset.h

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// -*- C++ -*-
//
// This file is part of YODA -- Yet more Objects for Data Analysis
// Copyright (C) 2008-2023 The YODA collaboration (see AUTHORS for details)
//
#ifndef YODA_INDEXEDSET_H
#define YODA_INDEXEDSET_H
 
#include <set>
#include <stdexcept>
#include <iostream>
 
namespace YODA {
  namespace Utils {
 
 
    template <typename T>
    class indexedset : public std::set<T> {
    public:
 
 
      const T& operator[](size_t index) const {
        if (index >= this->size()) {
          throw std::range_error("Requested index larger than indexed set size");
        }
        size_t i = 0;
        for (typename indexedset<T>::const_iterator it = this->begin(); it != this->end(); ++it) {
          // std::cout << i << "/" << index << ", " << (*it) << std::endl;
          if (i == index) return *it;
          i += 1;
        }
        // This should never be called: just keeping the compiler happy:
        return (*this)[0];
      }
 
 
    };
 
 
  }
}
 
#endif