constant.h

Go to the documentation of this file.

 
#if !defined(VITA_SRC_CONSTANT_H)
#define      VITA_SRC_CONSTANT_H
 
#include "kernel/gp/terminal.h"
#include "utility/utility.h"
 
namespace vita
{
 
template<class T>
class constant : public terminal
{
public:
  explicit constant(const std::string &c, category_t t = 0)
    : terminal(c, t), val_(lexical_cast<T>(c)) {}
  explicit constant(T c, category_t t = 0)
    : constant(std::to_string(c), t) {}
 
  [[nodiscard]] std::string display(terminal_param_t, format) const final
  { return std::to_string(val_); }
 
  value_t eval(symbol_params &) const override { return eval(); }
  value_t eval() const { return val_; }
 
private:
  T val_;
};
 
template<>
class constant<std::string> : public terminal
{
public:
  explicit constant(const std::string &c, category_t t = 0)
    : terminal(quote_str(c), t), val_(c) {}
  explicit constant(const char c[], category_t t = 0)
    : constant(std::string(c), t) {}
 
  [[nodiscard]] std::string display(terminal_param_t, format) const final
  {
    return quote_str(val_);
  }
 
  value_t eval(symbol_params &) const override { return eval(); }
  value_t eval() const { return val_; }
 
private:
  static std::string quote_str(const std::string &s) { return "\"" + s + "\"";}
 
  std::string val_;
};
 
}  // namespace vita
 
#endif  // include guard