【STL】- vector的用法

初始化：

1. 默认构造：

vector<int> vint;

2. 用包含10个元素的数组初始化：

vector<int> vint(ia, ia+10);

算法：

1. vint.push_back(i);

2. vint.size();

3. vint[i];

4. vint.erase(pos1, pos2);

代码：

 1 #include <vector>
 2 #include <iostream>
 3 #include <iterator>
 4 using namespace std;
 5 
 6 int ia[] = {1,2,3,4,5,6,7,8,9,10, 11,12};
 7 
 8 int main() {
 9     //initialize
10     vector<int> vint1;
11     vector<int> vint2(ia, ia+10);
12 
13     //push_back()
14     for(int i = 0; i <=6; ++i)
15         vint1.push_back(i);
16 
17     //no push_front()
18     //vint1.push_front(222);
19 
20     //size()
21     cout << "The size of vint1 is: " << vint1.size() << endl;
22 
23     //[] operator
24     for(int i = 0; i < vint2.size(); i++)
25         cout << vint2[i] << endl;
26 
27     vint2.erase(vint2.begin()+3, vint2.end());
28 
29     copy(vint2.begin(), vint2.end(), ostream_iterator<int>(cout, " "));
30 
31     return 0;
32 }

输出：

$ ./a.exe
The size of vint1 is: 7
1
2
3
4
5
6
7
8
9
10
1 2 3