一、C语言

• Channel.h

#pragma once
#include <stdbool.h>
// 定义函数指针
typedef int(*handleFunc)(void* arg);// 定义文件描述符的读写事件
enum FDEvent {TimeOut = 0x01,ReadEvent = 0x02,WriteEvent = 0x04
};struct Channel {// 文件描述符int fd;// 事件int events;// 回调函数handleFunc readCallback;// 读回调handleFunc writeCallback;// 写回调handleFunc destroyCallback;// 销毁回调// 回调函数的参数void* arg;
};// 初始化一个Channel 
struct Channel* channelInit(int fd, int events, handleFunc readFunc, handleFunc writeFunc,handleFunc destroyFunc, void* arg);// 修改fd的写事件（检测 or 不检测）
void writeEventEnable(struct Channel* channel, bool flag);// 判断是否需要检测文件描述符的写事件
bool isWriteEventEnable(struct Channel* channel);

• Channel.c

#include "Channel.h"
#include <stdlib.h>struct Channel* channelInit(int fd, int events, handleFunc readFunc, handleFunc writeFunc, handleFunc destroyFunc, void* arg) {struct Channel* channel = (struct Channel*)malloc(sizeof(struct Channel));channel->fd = fd;channel->events = events;channel->readCallback = readFunc;channel->writeCallback = writeFunc;channel->destroyCallback = destroyFunc;channel->arg = arg;return channel;
}void writeEventEnable(struct Channel* channel, bool flag) {if(flag) {channel->events |= WriteEvent;}else{channel->events = channel->events & ~WriteEvent;}
}bool isWriteEventEnable(struct Channel* channel) {return channel->events & WriteEvent;
}

二、C++

• Channel.h

#pragma once
#include <stdbool.h>
// 定义函数指针
// typedef int(*handleFunc)(void* arg);
using handleFunc = int(*)(void* arg);// 定义文件描述符的读写事件 (强类型枚举)
enum class FDEvent {TimeOut = 0x01,ReadEvent = 0x02,WriteEvent = 0x04
};class Channel 
{
public:Channel(int fd, int events, handleFunc readFunc, handleFunc writeFunc,handleFunc destroyFunc, void* arg);// 回调函数handleFunc readCallback;// 读回调handleFunc writeCallback;// 写回调handleFunc destroyCallback;// 销毁回调// 修改fd的写事件（检测 or 不检测）void writeEventEnable(bool flag);// 判断是否需要检测文件描述符的写事件bool isWriteEventEnable();// 取出私有成员的值inline int getEvent() {return m_events;}inline int getSocket() {return m_fd;}inline const void* getArg() {return m_arg;}
private:// 文件描述符int m_fd;// 事件int m_events;// 回调函数的参数void* m_arg;
};

• Channel.cpp 

#include "Channel.h"
#include <stdlib.h>Channel::Channel(int fd, int events, handleFunc readFunc, handleFunc writeFunc, handleFunc destroyFunc, void* arg) {m_fd = fd;m_events = events;m_arg = arg;readCallback = readFunc;writeCallback = writeFunc;destroyCallback = destroyFunc;
}void Channel::writeEventEnable(bool flag) {if(flag) {m_events |= static_cast<int>(FDEvent::WriteEvent);}else{m_events = m_events & ~static_cast<int>(FDEvent::WriteEvent);}
}bool Channel::isWriteEventEnable() {return m_events & static_cast<int>(FDEvent::WriteEvent);
}