operator_addition.hpp

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#ifndef STAN__AGRAD__FWD__OPERATORS__OPERATOR_ADDITION_HPP
#define STAN__AGRAD__FWD__OPERATORS__OPERATOR_ADDITION_HPP

#include <stan/agrad/fwd/fvar.hpp>
#include <stan/meta/traits.hpp>

namespace stan {

  namespace agrad {

    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+(const 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, const double x2) {
      return fvar<T>(x1.val_ + x2, x1.d_);
    }
  }
}
#endif