function.h

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#if !defined(ULTRA_FUNCTION_H)
#define      ULTRA_FUNCTION_H
 
#include "kernel/symbol.h"
#include "kernel/value.h"
 
#include <vector>
 
namespace ultra
{
class function : public symbol
{
public:
  using param_data_types = std::vector<category_t>;

  using return_type = category_t;
 
  class params;
 
  function(const std::string &, return_type, param_data_types);
  function(const std::string &, std::size_t);
 
  [[nodiscard]] category_t param_category(std::size_t) const noexcept;
  [[nodiscard]] const param_data_types &categories() const noexcept;
 
  [[nodiscard]] std::size_t arity() const noexcept;

  virtual value_t eval(const params &) const = 0;

  [[nodiscard]] virtual std::string to_string(format = c_format) const override;
 
  [[nodiscard]] bool is_valid() const override;
 
private:
  const param_data_types params_;
};

class function::params
{
public:
  [[nodiscard]] virtual value_t fetch_arg(std::size_t) const = 0;

  virtual value_t fetch_opaque_arg(std::size_t) const = 0;

  [[nodiscard]] value_t operator[](std::size_t i) const { return fetch_arg(i); }
 
  virtual ~params() = default;
};
 
}  // namespace ultra
 
#endif  // include guard