variable.h

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#if !defined(ULTRA_SRC_VARIABLE_H)
#define      ULTRA_SRC_VARIABLE_H
 
#include "kernel/terminal.h"
#include "kernel/gp/src/interpreter.h"
 
namespace ultra::src
{
class variable : public terminal
{
public:
  variable(std::size_t var_id, const std::string &name,
           category_t c = symbol::default_category)
    : terminal(name, c), var_(var_id)
  {}
 
  [[nodiscard]] value_t eval(const ultra::interpreter &i) const
  {
    Expects(dynamic_cast<const src::interpreter *>(&i));
    return static_cast<const src::interpreter &>(i).fetch_var(var_);
  }
 
  [[nodiscard]] value_t instance() const final { return this; }
 
private:
  std::size_t var_;
};
 
}  // namespace ultra
 
#endif  // include guard