#ifndef VARIABLE_H
#define VARIABLE_H

#include <string>
#include "Expression.h"

template<class T>
struct Variable : public Expression<T> {
  Variable(const std::string& name)
    : _name(name) { }

  std::string name() const {
    return this->_name;
  }

  T eval(const std::map<std::string, T>& values) const {
    return values.find(_name)->second;
  }

  private:
  const std::string _name;
};

#endif