39     typedef _Functor Functor;  typedef
40     typedef typename Functor::Scalar Scalar;
41     typedef typename Functor::InputType InputType;
42     typedef typename Functor::ValueType ValueType;
43     typedef typename Functor::JacobianType JacobianType;
45     NumericalDiff(Scalar _epsfcn=0.) : Functor(), epsfcn(_epsfcn) {}  in Functor()  function
46     NumericalDiff(const Functor& f, Scalar _epsfcn=0.) : Functor(f), epsfcn(_epsfcn) {}  in Functor()  function
50         NumericalDiff(const T0& a0) : Functor(a0), epsfcn(0) {}  in NumericalDiff()
52         NumericalDiff(const T0& a0, const T1& a1) : Functor(a0, a1), epsfcn(0) {}  in NumericalDiff()
54         NumericalDiff(const T0& a0, const T1& a1, const T2& a2) : Functor(a0, a1, a2), epsfcn(0) {}  in NumericalDiff()
57         InputsAtCompileTime = Functor::InputsAtCompileTime,
58         ValuesAtCompileTime = Functor::ValuesAtCompileTime
76         val1.resize(Functor::values());  in df()
77         val2.resize(Functor::values());  in df()
83                 Functor::operator()(x, val1); nfev++;  in df()
101                     Functor::operator()(x, val2);  in df()
108                     Functor::operator()(x, val2); nfev++;  in df()
110                     Functor::operator()(x, val1); nfev++;  in df()