C++之插入迭代器

1. #include<iostream>
2. #include<vector>
3. #include<list>
4. #include<iterator>
6. usingnamespace std;
8. template<typename T>
9. voidPrintElements(T c)
10. {
11. typename T::const_iterator itr = c.begin();//在GCC下typename不能省略
13. while(itr != c.end())
14. {
15. cout <<*itr++<<" ";
16. }
17. cout << endl;
18. }
20. int main()
21. {
22. vector<int> vecSrc;
23. list<int> vecDest;
25. for(vector<int>::size_type i =0; i <3;++i)
26. {
27. vecSrc.push_back(i);
28. }//--0,1,2---
31. /**
32. * 第一种方法是调用<iterator>头文件中的函数来返回一个back_insert_iterator对象
33. * template< class Container >
34. * std::back_insert_iterator<Container> back_inserter( Container& c );
35. */
36. /**
37. * 第二种方法是调用back_insert_iterator类的构造函数来创建类对象
38. * explicit
39. * back_insert_iterator(_Container& __x) : container(&__x) { }
40. */
41. copy(vecSrc.begin(), vecSrc.end(), back_inserter(vecDest));
42. //copy(vecSrc.begin(), vecSrc.end(), back_insert_iterator<list<int> >(vecDest));
43. PrintElements(vecDest);//--0,1,2---
45. copy(vecSrc.begin(), vecSrc.end(), front_inserter(vecDest));
46. //copy(vecSrc.begin(), vecSrc.end(), front_insert_iterator<list<int> >(vecDest));
47. PrintElements(vecDest);//--2,1,0,0,1,2---
49. copy(vecSrc.begin(),vecSrc.end(), inserter(vecDest,++vecDest.begin()));
50. //copy(vecSrc.begin(), vecSrc.end(), insert_iterator<list<int> >(vecDest, ++vecDest.begin()));
51. PrintElements(vecDest);//--2,0,1,2,1,0,0,1,2---
53. back_insert_iterator<list<int>> itBack = back_inserter(vecDest);//这里也可以直接调用构造函数
54. *itBack =101;
55. *itBack =102;//itBack每次都指向容器最后的元素
56. PrintElements(vecDest);//.....101,102
58. front_insert_iterator<list<int>> itFront = front_insert_iterator<list<int>>(vecDest);
59. *itFront =1001;
60. *itFront =1002;
61. PrintElements(vecDest);//1002,1001......
63. insert_iterator<list<int>> itIst = inserter(vecDest, vecDest.begin());
64. *itIst =11;
65. *itIst =12;
66. PrintElements(vecDest);//--11,12,1002,1001.....
67. // *itIst = value;相当于
68. // itIst = c.insert(it,value);
69. // ++itIst;
70. // insert函数返回的是指向插入元素的迭代器，由于该函数是在给定迭代器之前插入元素，所以++itIst之后
71. // itIst依然指向的是原来的元素。操作结束后itIst指向的位置未发生改变
73. return0;
74. }

 

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