diag_post_multiply.hpp

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#ifndef STAN_MATH_PRIM_FUN_DIAG_POST_MULTIPLY_HPP
#define STAN_MATH_PRIM_FUN_DIAG_POST_MULTIPLY_HPP
 
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
#include <stan/math/prim/fun/to_ref.hpp>
 
namespace stan {
namespace math {
 
template <typename T1, typename T2, require_eigen_t<T1>* = nullptr,
          require_eigen_vector_t<T2>* = nullptr,
          require_all_not_st_var<T1, T2>* = nullptr>
inline auto diag_post_multiply(T1&& m1, T2&& m2) {
  auto&& m1_ref = to_ref(std::forward<T1>(m1));
  auto&& m2_ref = to_ref(std::forward<T2>(m2));
  check_size_match("diag_post_multiply", "m2.size()", m2_ref.size(),
                   "m1.cols()", m1_ref.cols());
  return make_holder(
      [](auto&& m1_, auto&& m2_) {
        return std::forward<decltype(m1_)>(m1_)
               * std::forward<decltype(m2_)>(m2_).asDiagonal();
      },
      std::forward<decltype(m1_ref)>(m1_ref),
      std::forward<decltype(m2_ref)>(m2_ref));
}
 
}  // namespace math
}  // namespace stan
#endif