terminal.h

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#if !defined(ULTRA_TERMINAL_H)
#define      ULTRA_TERMINAL_H
 
#include "kernel/symbol.h"
#include "kernel/value.h"
 
namespace ultra
{

class terminal : public symbol
{
public:
  using symbol::symbol;

  [[nodiscard]] virtual value_t instance() const = 0;
 
  [[nodiscard]] std::string to_string(format = c_format) const override
  {
    return name();
  }
};

template<class T> concept Terminal = std::derived_from<T, terminal>;
 
}  // namespace ultra
 
#endif  // include guard