operator_subtraction.hpp

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#ifndef STAN_MATH_FWD_CORE_OPERATOR_SUBTRACTION_HPP
#define STAN_MATH_FWD_CORE_OPERATOR_SUBTRACTION_HPP
 
#include <stan/math/fwd/core/fvar.hpp>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> operator-(const fvar<T>& x1, const fvar<T>& x2) {
  return fvar<T>(x1.val_ - x2.val_, x1.d_ - x2.d_);
}
 
template <typename T>
inline fvar<T> operator-(double x1, const fvar<T>& x2) {
  return fvar<T>(x1 - x2.val_, -x2.d_);
}
 
template <typename T>
inline fvar<T> operator-(const fvar<T>& x1, double x2) {
  return fvar<T>(x1.val_ - x2, x1.d_);
}
 
}  // namespace math
}  // namespace stan
#endif