我知道有几个类似的问题(通告包括)出栈计算器和其他网站。但我仍然无法弄清楚,没有解决方案。所以我想发布我的具体内容。错误:在'{'令牌之前预期的类名
我有一个Event类,它有2个实际上更多的子类,它们是Arrival和Landing。编译器(g ++)抱怨:
g++ -c -Wall -g -DDEBUG Event.cpp -o Event.o
In file included from Event.h:15,
from Event.cpp:8:
Landing.h:13: error: expected class-name before ‘{’ token
make: *** [Event.o] Error 1
人们说这是一个循环包括。是3的头文件(Event.h Arrival.h Landing.h)如下:
的Event.h:
#ifndef EVENT_H_
#define EVENT_H_
#include "common.h"
#include "Item.h"
#include "Flight.h"
#include "Landing.h"
class Arrival;
class Event : public Item {
public:
Event(Flight* flight, int time);
virtual ~Event();
virtual void occur() = 0;
virtual string extraInfo() = 0; // extra info for each concrete event
// @implement
int compareTo(Comparable* b);
void print();
protected:
/************** this is why I wanna include Landing.h *******************/
Landing* createNewLanding(Arrival* arrival); // return a Landing obj based on arrival's info
private:
Flight* flight;
int time; // when this event occurs
};
#endif /* EVENT_H_ */
Arrival.h:
#ifndef ARRIVAL_H_
#define ARRIVAL_H_
#include "Event.h"
class Arrival: public Event {
public:
Arrival(Flight* flight, int time);
virtual ~Arrival();
void occur();
string extraInfo();
};
#endif /* ARRIVAL_H_ */
Landing.h
#ifndef LANDING_H_
#define LANDING_H_
#include "Event.h"
class Landing: public Event {/************** g++ complains here ****************/
public:
static const int PERMISSION_TIME;
Landing(Flight* flight, int time);
virtual ~Landing();
void occur();
string extraInfo();
};
#endif /* LANDING_H_ */
UPDATE:
我公司luded Landing.h由于着陆的构造函数被调用的事件:: createNewLanding方法:
Landing* Event::createNewLanding(Arrival* arrival) {
return new Landing(flight, time + Landing::PERMISSION_TIME);
}
根据编译器输出,你的错误在'Landing.h'中(在第13行)。为什么你在'Event.h'中发表评论说错误在那里? – 2011-03-16 01:13:43
@Ben Voigt对不起,我改变了它 – draw 2011-03-16 01:21:22