C++ STL vector assign用法

来源：互联网发布：unity3d建筑可视化编辑：程序博客网时间：2024/06/05 20:05

原帖地址：http://blog.163.com/chen_dawn/blog/static/112506320112953921372/

vector::assign //用来构造一个vector的函数，类似于copy函数
void assign( size_type _Count, const Type& _Val);

//_Count指要构造的vector成员的个数， _Val指成员的数值，他的类型必须与vector类型一致！
template<class InputIterator>
void assign( InputIterator _First, InputIterator _Last );
//两个指针，分别指向复制开始和结束的地方!
EXAMPLE

// vector_assign.cpp// compile with: /EHsc#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);   cout << "v1 = " ;   for (iter = v1.begin(); iter != v1.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, 4) ;   cout << "v3 = ";   for (iter = v3.begin(); iter != v3.end(); iter++)       cout << *iter << " ";   cout << endl;}

输出结果为：

v1 = 10 20 30 40 50 v2 = 10 20 30 40 50 v3 = 4 4 4 4 4 4 4

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