/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/JetMETCorrections/FFTJetObjects/interface/FFTJetDict.h

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#ifndef JetMETCorrections_FFTJetObjects_FFTJetDict_h
#define JetMETCorrections_FFTJetObjects_FFTJetDict_h

//
// This template provides a variation of std::map with
// subscripting operator which does not automatically
// insert default values
//
// I. Volobouev
// 08/03/2012

#include <map>
#include "FWCore/Utilities/interface/Exception.h"

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

template<class Key,class T,class Compare,class Allocator>
T& FFTJetDict<Key,T,Compare,Allocator>::
operator[](const Key& key) const
{
    typename FFTJetDict<Key,T,Compare,Allocator>::const_iterator it = 
        this->find(key);
    if (it == std::map<Key,T,Compare,Allocator>::end())
        throw cms::Exception("KeyNotFound")
            << "FFTJetDict: key \"" << key << "\" not found\n";
    return const_cast<T&>(it->second);
}

#endif // JetMETCorrections_FFTJetObjects_FFTJetDict_h