C++综合系列之模拟事件机制

#include <iostream>
#include <string>

using namespace std;

#define DEF_EVENT_TYPE( etype )     \
class _CEvent##etype##_leveling_      \
{       \
public:     \
virtual void Do(_EVENT_##etype##_FUN_ARGS) = 0;      \
};      \
class CEvent##etype     \
{       \
public:     \
CEvent##etype()     \
{ _pl = NULL; }     \
void etype( _EVENT_##etype##_FUN_ARGS )     \
{ if( NULL != _pl )     _pl->Do(_EVENT_##etype##_ACT_ARGS); }      \
void Bind( _CEvent##etype##_leveling_ * pl )     \
{ _pl = pl; }       \
private: \
_CEvent##etype##_leveling_ *_pl;     \
};

#define REG_EVENT_LEVELING( name, etype, platform, fun)     \
class _##platform##_##fun##_ : public _CEvent##etype##_leveling_      \
{       \
public:     \
_##platform##_##fun##_( platform &p ) : _p(p)      \
{ }     \
virtual void Do( _EVENT_##etype##_FUN_ARGS )     \
{ _p.fun( _EVENT_##etype##_ACT_ARGS ); }        \
public:     \
platform &_p;      \
}name;

#define _EVENT_Dance_FUN_ARGS void
#define _EVENT_Dance_ACT_ARGS
DEF_EVENT_TYPE( Dance )

#define _EVENT_Rollerskating_FUN_ARGS const string& shoes
#define _EVENT_Rollerskating_ACT_ARGS shoes
DEF_EVENT_TYPE( Rollerskating )

#define _EVENT_Frontier_FUN_ARGS const string& reynolds, const string& pet
#define _EVENT_Frontier_ACT_ARGS reynolds, pet
DEF_EVENT_TYPE( Frontier )

class QQSPeedBoss
{
public:
void dispatchTask()
{
m_dance.Dance();
m_rollerskatinge.Rollerskating("roller shoes");
m_frontier.Frontier("reynold", "penguin");
}

public:
CEventDance          m_dance;
CEventRollerskating  m_rollerskatinge;
CEventFrontier       m_frontier;
};

class YY
{
public:
YY()
: m_dance( *this ), m_rollerskating( *this ), m_frontier( *this )
{

}

void dance()
{
cout << "I'm dancing." << endl;
}
void rollerskating(const string& shoes)
{
cout << "I'm rollerskating by " << shoes << "." << endl;
}
void frontier(const string& reynolds, const string& pet)
{
cout << "I'm driving " << reynolds << " in frontier carring with " << pet << "." << endl;
}

REG_EVENT_LEVELING( m_dance,         Dance,         YY, dance )
REG_EVENT_LEVELING( m_rollerskating, Rollerskating, YY, rollerskating )
REG_EVENT_LEVELING( m_frontier,      Frontier,      YY, frontier )
};

#include <iostream>
#include "event.h"

using namespace std;

int main()
{
//4.事件绑定和触发处理(以QQ飞车游戏老板和代练平台为例)
QQSPeedBoss boss;
YY yy;
boss.m_dance.Bind(&yy.m_dance);
boss.m_rollerskatinge.Bind(&yy.m_rollerskating);
boss.m_frontier.Bind(&yy.m_frontier);
boss.dispatchTask();

return 0;
}