Created
June 27, 2013 06:14
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#include <stdio.h> | |
class Message; | |
class MoveMessage; | |
class StopMessage; | |
class MessageVisitor { | |
public: | |
virtual int visit(MoveMessage &msg) = 0; | |
virtual int visit(StopMessage &msg) = 0; | |
}; | |
class Message { | |
public: | |
virtual int accept(MessageVisitor *visitor) = 0; | |
}; | |
class MoveMessage: public Message { | |
public: | |
int x; | |
int y; | |
MoveMessage(int x,int y): x(x), y(y) { | |
} | |
virtual int accept(MessageVisitor *visitor) { | |
return visitor->visit(*this); | |
} | |
}; | |
class StopMessage: public Message { | |
public: | |
StopMessage() {} | |
virtual int accept(MessageVisitor *visitor) { | |
return visitor->visit(*this); | |
} | |
}; | |
class AcceptMessage: public MessageVisitor { | |
public: | |
AcceptMessage() {}; | |
virtual int visit(MoveMessage &msg) { | |
printf("Moving to x:%d, y:%d\n", msg.x, msg.y); | |
return 0; | |
}; | |
virtual int visit(StopMessage &msg) { | |
printf("Stopping\n"); | |
return 0; | |
} | |
}; | |
int acceptMessage(Message* msg) { | |
static AcceptMessage vstr; | |
msg->accept(&vstr); | |
} | |
int main (int argc, char** argv) { | |
MoveMessage m(20, 20); | |
MoveMessage m2(10, 10); | |
StopMessage m3; | |
acceptMessage(&m); | |
acceptMessage(&m2); | |
acceptMessage(&m3); | |
return 0; | |
} |
int acceptMessage(const Message &msg) {
static AcceptMessage vstr;
Message *msg2 = (Message *)&msg;
return msg2->accept(&vstr);
}
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int acceptMessage(const Message &msg) {
static AcceptMessage vstr;
Message *msg2 = (Message *)&msg;
msg2->accept(&vstr);
}
int main (int argc, char** argv) {
acceptMessage(MoveMessage(20, 20));
acceptMessage(MoveMessage(10, 10));
acceptMessage(StopMessage());
return 0;
}