作业
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sstream>
#include <vector>
#include <memory>using namespace std; class S{
private:int a;int b;
public:S(int a=0,int b=0):a(a),b(b){}void setA(int l){a=l;}void setB(int l){b=l;}int getA(){return a;}int getB(){return b;}
};class Z:public S
{
public:Z(int ab=0):S(ab,ab){}void setA(int a){S::setA(a);S::setB(a);}void setB(int b){S::setA(b);S::setB(b);}
};int main(int argc,const char** argv)
{Z ab;ab.setA(3);ab.setB(4);
}
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sstream>
#include <vector>
#include <memory>using namespace std; class ABC{
private:int a;int b;int c;
public:ABC(int a=0,int b=0,int c=0):a(a),b(b),c(c){}void setA(int l){a=l;}void setB(int l){b=l;}void setC(int l){c=l;}int getA(){return a;}int getB(){return b;}int getC(){return c;}
};class AAC:public ABC
{
public:AAC(int ab=0,int c=0):ABC(ab,ab,c){}void setA(int a){ABC::setA(a);ABC::setB(a);}void setB(int b){ABC::setA(b);ABC::setB(b);}void setC(int c){ABC::setA(c);ABC::setB(c);}
};class AAA:public AAC
{
public:AAA(int ab=0):AAC(ab,ab){}void setA(int a){AAC::setA(a);AAC::ABC::setC(a);}void setB(int b){AAC::setB(b);AAC::ABC::setC(b);}void setC(int c){AAC::setC(c);AAC::ABC::setC(c);}
};int main(int argc,const char** argv)
{AAC aac;aac.setA(4);aac.setB(5);aac.setC(6);AAA aaa;aaa.setA(5);aaa.setB(7);aaa.setC(13);
}
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sstream>
#include <vector>
#include <memory>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>using namespace std;class Msg{
private:key_t key;int id;int channel;struct msgbuf{long channel;char text[512];};
public:Msg(const string& filename = ""){key = ftok(filename.data(),1);id = msgget(key,IPC_CREAT | 0666);}~Msg(){msgctl(id,IPC_RMID,0);}void send(const string& str){msgbuf buf = {0}; strcpy(buf.text,str.data());buf.channel = channel;msgsnd(id,&buf,str.length(),0);}string recv(int size=512){msgbuf buf = {0};msgrcv(id,&buf,size,channel,0);string str = buf.text;return str;}Msg& operator<<(const string& str){send(str);return *this;}Msg& operator>>(string& str){str = recv();return *this;}Msg& operator[](int channel);
};Msg& Msg::operator[](int channel){this->channel = channel;return *this;
}int main(int argc,const char** argv){Msg m("./ipc");m[1] << "helloworld";string str;m[1] >> str;cout << str << endl;
}
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sstream>
#include <vector>
#include <memory>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>using namespace std; class Sem{
private:key_t key;int id;int index;
public:Sem(int x,int y){key = ftok("./ipc",2);id = semget(key,x,IPC_CREAT | 0666);for(int i=0;i<x;i++){semctl(id,i,SETVAL,y);}}void init(int y){semctl(id,index,SETVAL,y);}Sem& operator-(int y){struct sembuf buf = {0};buf.sem_num = index;buf.sem_op = -abs(y);buf.sem_flg = SEM_UNDO;semop(id,&buf,1);return *this;}Sem& operator+(int y){struct sembuf buf = {0};buf.sem_num = index;buf.sem_op = abs(y);buf.sem_flg = SEM_UNDO;semop(id,&buf,1);return *this;}Sem& operator++(){return *this+1;}Sem& operator--(){return *this-1;}Sem& operator[](int y){index = y;return *this;}~Sem(){semctl(id,1,IPC_RMID);}
};int main(int argc,const char** argv)
{Sem s(3,0);s[1].init(10);s[1] + 1;s[1] - 1;}