Stan Math Library  2.12.0
reverse mode automatic differentiation
operator_subtraction.hpp
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1 #ifndef STAN_MATH_FWD_CORE_OPERATOR_SUBTRACTION_HPP
2 #define STAN_MATH_FWD_CORE_OPERATOR_SUBTRACTION_HPP
3 
5 
6 namespace stan {
7  namespace math {
8 
9  template <typename T>
10  inline
11  fvar<T>
12  operator-(const fvar<T>& x1, const fvar<T>& x2) {
13  return fvar<T>(x1.val_ - x2.val_, x1.d_ - x2.d_);
14  }
15 
16  template <typename T>
17  inline
18  fvar<T>
19  operator-(const double x1, const fvar<T>& x2) {
20  return fvar<T>(x1 - x2.val_, -x2.d_);
21  }
22 
23  template <typename T>
24  inline
25  fvar<T>
26  operator-(const fvar<T>& x1, const double x2) {
27  return fvar<T>(x1.val_ - x2, x1.d_);
28  }
29  }
30 }
31 #endif
fvar< T > operator-(const fvar< T > &x1, const fvar< T > &x2)

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