operator_unary_negative.hpp

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#ifndef STAN_MATH_REV_CORE_OPERATOR_UNARY_NEGATIVE_HPP
#define STAN_MATH_REV_CORE_OPERATOR_UNARY_NEGATIVE_HPP
 
#include <stan/math/prim/meta.hpp>
#include <stan/math/rev/core/var.hpp>
#include <stan/math/rev/core/callback_vari.hpp>
#include <stan/math/prim/fun/constants.hpp>
#include <stan/math/prim/fun/is_nan.hpp>
 
namespace stan {
namespace math {
 
inline var operator-(const var& a) {
  return make_callback_var(
      -a.val(), [a](const auto& vi) mutable { a.adj() -= vi.adj(); });
}
 
template <typename T, require_var_matrix_t<T>* = nullptr>
inline auto operator-(const T& a) {
  return make_callback_var(-a.val(), [a](const auto& vi) mutable {
    for (Eigen::Index j = 0; j < a.cols(); ++j) {
      for (Eigen::Index i = 0; i < a.rows(); ++i) {
        a.adj().coeffRef(i, j) -= vi.adj().coeff(i, j);
      }
    }
  });
}
 
}  // namespace math
}  // namespace stan
#endif