Abs.h

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#ifndef PhysicsTools_Utilities_Abs_h
#define PhysicsTools_Utilities_Abs_h
#include <cmath>

namespace funct {

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

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

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

}  // namespace funct

#endif