for_ Example of each usage

Preface

Due to accidental discovery for_each Can avoid using for loop , Greatly simplified the code . Here is a simple record of for_each A simple example of demo, Convenient review .

Example demo

#include <iostream>
#include "vector"
#include "algorithm"

void myfunc1(int i)
{
    
    std::cout << i << " ";
}

int main() {
    
  
    std::vector<int> arr{
     3, 4, 2, 6, 5, 1 };

    std::cout << "based on for_each, print the vector\n";
    for_each(arr.begin(), arr.end(), myfunc1);
    std::cout << "\n";

    std::cout << "based on lambda, print the vector\n";
    for_each(arr.begin(), arr.end(), [](const auto &i){
    std::cout << i << " ";});

    return 0;
}