nullary.h

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#if !defined(ULTRA_NULLARY_H)
#define      ULTRA_NULLARY_H
 
#include "kernel/terminal.h"
 
namespace ultra
{
class nullary : public terminal
{
public:
  using terminal::terminal;
 
  [[nodiscard]] virtual value_t eval() const = 0;
  [[nodiscard]] value_t instance() const final { return this; }
 
  [[nodiscard]] std::string to_string(format = c_format) const override
  { return name() + "()"; }
};
 
}  // namespace ultra
 
#endif  // include guard