interpret.h

c++程序

#ifndef _INTERPRET_H_
#define _INTERPRET_H_
#include "Context.h" 
#include <string> 
using namespace std;

class AbstractExpression 
{ 
public: 
	virtual ~AbstractExpression();
	virtual void Interpret(const Context& c);
protected: 
	AbstractExpression();
private:
};

class TerminalExpression:public AbstractExpression 
{ 
public: 
	TerminalExpression(const string& statement);
	~ TerminalExpression();
	void Interpret(const Context& c);
protected:
private: 
	string _statement; 
};

class NonterminalExpression:public AbstractExpression 
{ 
public: 
	NonterminalExpression(AbstractExpression* expression,int times);
	~ NonterminalExpression();
	void Interpret(const Context& c);
protected:
private: 
	AbstractExpression* _expression;
	int _times; 
};

#endif