evalexpr_symbol.h

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#ifndef EVALEXPR_SYMBOL_INCLUDED
#define EVALEXPR_SYMBOL_INCLUDED
 
#include <map>
#include <string>
#include "IO/bridgeIO.h"
 
typedef double (*function_t)(double);
 
class SymbolTable
{
 private:
 
  enum ValueType { VARIABLE, FUNCTION, };
 
  struct SymbolRecord
  {
    ValueType type;
    union
    {
      double     val;
      function_t fptr;
    }
              value;
  };
 
  typedef std::map<std::string, SymbolRecord> SymbolMap_t;
 
  SymbolMap_t table;
 
 public:
 
  bool find_symbol(const std::string& name);
 
  bool put_symbol(const std::string& name, const double value);
  bool put_symbol(const std::string& name, const function_t tptr);
 
  double get_symbol_value(const std::string& name) const;
  function_t get_symbol_function(const std::string& name) const;
 
  void print() const;
};
#endif