STL之vector使用详解

好久不用STL了，忘的差不多了，总结一下vector的使用方式，就不对每个方法做出详细解释了，只给出了如何用

void testVector()
{
	int a[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
	//构造一个元素值全为2大小为10的vector
	vector<int> v1(10,2);
	//用指针构造
	vector<int> v2(a, a + 10);
	//用vector iterator构造
	vector<int> v3(v2.begin(), v2.end());
	//构造一个和v1一样的vector
	vector<int> v4(v1);

	//使用[]操作符进行遍历
	cout << "=================v1===============" << endl;
	for (int i = 0; i < v1.size(); i++)
	{
		cout << v1[i] << " ";
	}
	cout << endl;



	vector<int>::iterator it;
	//得到第2个元素的iterator
	it = v2.begin() + 1;
	//移除第2个元素，返回移除元素后一个元素的iterator
	vector<int>::iterator erase_it = v2.erase(it);
	cout << *erase_it << endl;
	//移除之后就不能通过iterator访问了
	//cout << *it << endl;
	//通过iterator 遍历
	cout << "=================v2===============" << endl;
	for (it = v2.begin();  it != v2.end(); it++)
	{
		cout << *it << " ";
	}
	cout << endl;

	//逆序遍历
	cout << "=================v3 reserver======" << endl;
	vector<int>::reverse_iterator rit;
	for ( rit = v3.rbegin(); rit != v3.rend() ; rit++)
	{
		cout << *rit << " ";
	}
	cout << endl;


	cout << "=================v4 swap v3========" << endl;
	//交换v4和v3的内容
	v4.swap(v3);
	for (int i = 0; i < v4.size(); i++)
	{
		cout << v4[i] << " ";
	}
	cout << endl;


	cout << "============v4 push pop insert======" << endl;
	//在v4末尾插入100
	v4.push_back(100);
	//将末尾的100移除
	v4.pop_back();
	//在第二个元素位置插入1000
	v4.insert(v4.begin() + 1, 1000);
	//在第二个元素位置插入2个200
	v4.insert(v4.begin() + 1, 2, 200);
	//在第二个元素位置插入2个v1的开始到结束
	v4.insert(v4.begin() + 1, v1.begin(), v1.end());
	for (int i = 0; i < v4.size(); i++)
	{
		cout << v4[i] << " ";
	}
	cout << endl;

	cout << "============v4 clear empty size======" << endl;
	//清除v4中所有内容
	v4.clear();
	//检查v4是否为空
	if (v4.empty())
	{
		cout << "v4 is empty" << endl;
		cout << "v4 size = "<<v4.size() << endl;
	}
}

以下是测试结果