c++ 遍历算法 c++ STL常用遍历算法

#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;
}

#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;
}