//======================================================================
// ConstSubscriptMap.hh
//
// This template provides a variation of std::map with const
// subscripting operator. It aborts the program in case the key
// can not be found.
//
// I. Volobouev
// 03/12/2001
//======================================================================

#ifndef CONSTSUBSCRIPTMAP_HH
#define CONSTSUBSCRIPTMAP_HH

#include <map>
#include <iostream>
#include <cstdlib>

template <class Key, class T,
          class Compare = std::less<Key>,
          class Allocator = std::allocator<std::pair<const Key,T> > >
class ConstSubscriptMap : public std::map<Key,T,Compare,Allocator>
{
public:
    inline const T& operator[](const Key&) const;
};

template<class Key,class T,class Compare,class Allocator>
const T& ConstSubscriptMap<Key,T,Compare,Allocator>::
operator[](const Key& key) const
{
    typename ConstSubscriptMap<Key,T,Compare,Allocator>::const_iterator it = find(key);
    if (it == std::map<Key,T,Compare,Allocator>::end())
    {
	std::cerr << "ConstSubscriptMap: key \"" << key << "\" not found."
		  << "\nAborting." << std::endl;
	abort();
    }
    return it->second;
}

#endif // CONSTSUBSCRIPTMAP_HH