Tan.h

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#ifndef PhysicsTools_Utilities_Tan_h
#define PhysicsTools_Utilities_Tan_h
#include <cmath>

namespace funct {

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

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

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

#endif