list对象指针与指针类型list

时间：2021-03-25 16:56:25
 #include <string>

 #include <cctype>

 #include <algorithm>

 #include <iostream>

 #include <list>

 using namespace std;

 class Base{

 public:

         int data;

         Base(int y):data(y){}

 };

 Base *pt(int x){

         Base *tmp = new Base(x);

         return tmp;

 }

 int main()

 {

         string str("ceshi andx 123 benjing");

         int x = 0;

         char first[6] = {0};

         char last[16] = {0};

         char mid[16] = {0};

         int ret = sscanf(str.c_str(), "%s%s%d%s", first, mid, &x, last);

         cout << ret <<  " first:" << first << " mid:" << mid << " x:" << x << " last:" << last << endl;

         //int指针类型的list

         list<int *> intptr;

         int *tmp = new int[];

         for(int i=; i<; i++){

                 tmp[i] = i;

                 intptr.push_back(&tmp[i]);

         }

         list<int *>::iterator liter;

         for(liter  = intptr.begin(); liter != intptr.end(); ++liter)

                 cout << **liter << endl;

         for (std::list<int*>::iterator it = intptr.begin(); it != intptr.end();it++)

         {

                 //delete &it; //error

         }

         delete[] tmp;

         //以下list对象指针均建立在堆上，需要new/delete结合申请与释放

         //list元素为基本数据类型的对象指针

         list<int> *ptr = new list<int>[2];

         ptr->push_back(2);

         ptr->push_back(3);

         list<int>::iterator iter;

         for(iter  = ptr->begin(); iter != ptr->end(); ++iter)

                 cout << *iter << endl;

         delete[] ptr;

         //list元素为自定义类型的对象指针

         list<Base> *pBase = new list<Base>[5];

         Base ba(4);

         Base bb(5);

         pBase->push_back(ba);

         pBase->push_back(bb);

         list<Base>::iterator iterb;

         for(iterb  = pBase->begin(); iterb != pBase->end(); ++iterb)

                 cout << (*iterb).data << endl;

         delete[] pBase;

 }

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