需要引入头文件#include<algorithm>
1.for_each
#include<iostream>
using namespace std;
#include <vector>
#include <algorithm>
class MyPrint {
public:
void operator()(int val) const{
cout << val << " ";
}
};
void printVector(int val) {
cout << val << " ";
}
void test() {
vector<int> v1;
for (int i = 0; i < 10; i++)
{
v1.push_back(i);
}
//利用普通函数
for_each(v1.begin(), v1.end(), printVector);
cout << endl;
//利用仿函数
for_each(v1.begin(), v1.end(), MyPrint());
cout << endl;
}
int main() {
test();
system("pause");
return 0;
}
2.transform:将容器搬运到另一个容器中
#include<iostream>
using namespace std;
#include <vector>
#include <algorithm>
class Transform {
public:
int operator()(int val) const{
//这里可以对val进行一些判断
return val;
}
};
class MyPrint {
public:
void operator()(int val) const {
cout << val << " ";
}
};
void test() {
vector<int> v1;
for (int i = 0; i < 10; i++)
{
v1.push_back(i);
}
vector<int> v2;
//目标容器需要先开辟空间
v2.resize(v1.size());
transform(v1.begin(), v1.end(), v2.begin(), Transform());
for_each(v2.begin(), v2.end(), MyPrint());
cout << endl;
}
int main() {
test();
system("pause");
return 0;
}