技術標籤：C/C++基礎

先看原型：
void assign(size_type count, value_type val);

template
void assign(InIt first, InIt last);

共有三個函式過載，第三個咱也看不懂，不知道咋用，就不寫了。

#include<iostream>
#include <vector>
#include <algorithm>
using namespace std;

void main()
{
	vector < int > m_vc1{1, 2, 3, 4, 5, 6}
 
;
	cout << "m_vc1的元素:\n";
	for (auto node : m_vc1)
	{
		cout << node << " ";
	}
	cout << endl;

	cout << "m_vc2的元素:\n";
	vector<int> m_vc2;
	m_vc2.assign(6, 8);//6個100，共六個元素

	for_each(m_vc2.begin(), m_vc2.end(), [](int a){cout << a <<
 
 " "; });
	cout << endl;

	vector<int> m_vc3;
	m_vc3.assign(m_vc1.begin(), m_vc1.end()-1);//比m_vc1少一個元素，也是是5個

	cout << "m_vc3的元素:\n";
	for_each(m_vc3.begin(), m_vc3.end(), [](int a){cout << a << " "; });
	cout << endl;

	m_vc2.assign(m_vc1.
 
begin(), m_vc1.end() - 2);//比m_vc1少一個元素，也是是4個
	cout << "m_vc2的元素:\n";
	for_each(m_vc2.begin(), m_vc2.end(), [](int a){cout << a << " "; });
	cout << endl;

	system("pause");
}

結果: