Exp.h

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#ifndef PhysicsTools_Utilities_Exp_h
#define PhysicsTools_Utilities_Exp_h

#include <cmath>

namespace funct {

  template<typename T>
  struct ExpStruct {
    ExpStruct(const T& t) : _(t) { }
    inline double operator()() const { return ::exp(_()); }
    T _; 
  };

  template<typename T>
  struct Exp {
    typedef ExpStruct<T> type;
    inline static type compose(const T& t) { return type(t); }
  };

  template<typename T>
  inline typename Exp<T>::type exp(const T & t) { return Exp<T>::compose(t); }

}

#endif