#ifndef STAN_LANG_AST_NODE_LUB_IDX_HPP
#define STAN_LANG_AST_NODE_LUB_IDX_HPP

#include <stan/lang/ast/node/expression.hpp>

namespace stan {
namespace lang {

/**
 * AST structure for lower and upper bounds.
 */
struct lub_idx {
  /**
   * Lower bound.
   */
  expression lb_;

  /**
   * Upper bound.
   */
  expression ub_;

  /**
   * Construct a default (nil valued) lower and upper bound index.
   */
  lub_idx();

  /**
   * Construt a lower and upper bound index with the specified
   * bounds.
   *
   * @param lb lower bound
   * @param ub upper bound
   */
  lub_idx(const expression& lb, const expression& ub);
};

}  // namespace lang
}  // namespace stan
#endif
