C++STL中vector容器 assign()函数的用法

http://blog.sina.com.cn/s/blog_7b3a697301014aam.html

assign函数:

函数原型：

void assign(const_iterator first,const_iterator last);

void assign(size_type n,const T& x = T());

功能：

将区间[first,last)的元素赋值到当前的vector容器中，或者赋n个值为x的元素到vector容器中，这个容器会清除掉vector容器中以前的内容。

实例：

#include <vector>

#include <iostream>

int main( )

{

using namespace std;

vector<int> v1, v2, v3;

vector<int>::iterator iter;

v1.push_back(10);

v1.push_back(20);

v1.push_back(30);

v1.push_back(40);

v1.push_back(50);

v2.push_back(1);

v2.push_back(2);

cout << "v1 = " ;

for (iter = v1.begin(); iter != v1.end(); iter++)

cout << *iter << " ";

cout << endl;

cout << "v2 = ";

for (iter = v2.begin(); iter != v2.end(); iter++)

cout << *iter << " ";

cout << endl;

v2 = v1;

cout << "v2 = ";

for (iter = v2.begin(); iter != v2.end(); iter++)

cout << *iter << " ";

cout << endl;

v2.assign(v1.begin(), v1.end());

cout << "v2 = ";

for (iter = v2.begin(); iter != v2.end(); iter++)

cout << *iter << " ";

cout << endl;

v3.assign(7, 3) ;

cout << "v3 = ";

for (iter = v3.begin(); iter != v3.end(); iter++)

cout << *iter << " ";

cout << endl;

return 0;

}