C++STL库的vector类中获取大小函数的含义

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经过测试，总结如下：

	vector<int> test;
	test.push_back(1);  //1
	test.push_back(1);  //2
	test.push_back(1);  //3
	test.push_back(1);//4
	test.push_back(1);//5
	test.push_back(1);//6
	test.push_back(1);//7
	test.push_back(1);//8
	cout << test.max_size()<<endl<<test.capacity()<<endl<<test.size();//输出1073741823，9，8