broadcast_array.hpp

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#ifndef STAN_MATH_FWD_FUNCTOR_BROADCAST_ARRAY_HPP
#define STAN_MATH_FWD_FUNCTOR_BROADCAST_ARRAY_HPP
 
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/fwd/fun/sum.hpp>
#include <stan/math/prim/functor/broadcast_array.hpp>
#include <stan/math/prim/meta.hpp>
 
namespace stan {
namespace math {
namespace internal {
 
template <typename T>
class broadcast_array<T, require_st_fvar<T>> {
 private:
  std::reference_wrapper<T> prim_;
 
 public:
  template <typename TT>
  explicit broadcast_array(TT&& prim) : prim_(std::forward<TT>(prim)) {}
 
  T& operator[](int /*i*/) { return prim_.get(); }
 
  template <typename Y>
  void operator=(const Y& m) {
    prim_.get() = sum(m);
  }
};
 
}  // namespace internal
}  // namespace math
}  // namespace stan
#endif