C++学习笔记之STL基础

#include <iostream>
#include <string>
using namespace std;
#include <vector>
#include <algorithm>
#include <string>
void MyPrint(int val)
{
cout << val << endl;
}
void test01()
{
vector<int> v1;//创建vector容器存放数据类型为int
v1.push_back(10);
v1.push_back(20);
v1.push_back(30);

vector<int>::iterator it1 = v1.begin();//v.begin()迭代器，指向容器的第一个元素
vector<int>::iterator it2 = v1.end();//v.end()迭代器，指向容器最后一个元素的下一个元素
//第一种遍历容器内元素的方式
for (vector<int>::iterator i = it1; i != it2; i++)
{
cout << *i << endl;
}
//第二种遍历容器内元素的方式
while (it1 != it2)
{
cout << *it1 << endl;
it1++;
}
//第三种遍历容器内元素的方式
for_each(v1.begin(), v1.end(), MyPrint);//使用STL标准遍历算法,包含algorithm头文件
}
class Person
{
public:
Person(string name, int age)
{
m_name = name;
m_age = age;
}
public:

string m_name;
int m_age;
};

void test02()
{
vector<Person> v2;
Person p1("张三三",10);
Person p2("王一一",14);
Person p3("周七七",16);
v2.push_back(p1);
v2.push_back(p2);
v2.push_back(p3);
for (vector<Person>::iterator vit1 = v2.begin(); vit1 != v2.end(); vit1++)
{
cout << (*vit1).m_name << " " << (*vit1).m_age << endl;
}
}
void test03()
{
//存放对象指针
vector<Person*> v2;
Person p1("张三三", 10);
Person p2("王一一", 14);
Person p3("周七七", 16);
v2.push_back(&p1);
v2.push_back(&p2);
v2.push_back(&p3);
for (vector<Person*>::iterator vit1 = v2.begin(); vit1 != v2.end(); vit1++)
{
cout << (*vit1)->m_name << " " << (*vit1)->m_age << endl;
}
}
void test04()
{
//容器嵌套容器
vector<vector<int>> v;
vector<int> v1;
vector<int> v2;
vector<int> v3;
vector<int> v4;
for (int i = 0; i < 4; i++)
{
v1.push_back(i + 1);
v2.push_back(i + 2);
v3.push_back(i + 3);
v4.push_back(i + 4);
}
//将小容器放进大容器
v.push_back(v1);
v.push_back(v2);
v.push_back(v3);
v.push_back(v4);
for (vector<vector<int>>::iterator vit1 = v.begin(); vit1 != v.end(); vit1++)//循环小容器
{
for (vector<int>::iterator vit2 = (*vit1).begin(); vit2 != (*vit1).end(); vit2++)//循环小容器内部元素
{
cout << (*vit2) << " " ;
}
cout << endl;

}
}
int main() {


test01();
test02();
test03();
test04();
system("pause");
return 0;
}