Listing 1: Funktionszeiger for_each
#include <algorithm>
#include <iomanip>
#include <iostream>
#include <vector>

void add3(int& i){
  i +=3;
}

int main(){
  std::cout << std::endl;

  std::vector<int> myVec1{1,2,3,4,5,6,7,8,9,10};
  std::cout << std::setw(20) << std::left << "myVec1: i->i+3:     ";
  std::for_each(myVec1.begin(),myVec1.end(),&add3);
  for (auto v: myVec1) std::cout << std::setw(6) << std::left << v;

  std::cout << "\n\n";
}



Listing 2: Funktionsobjekte

#include <algorithm>
#include <iomanip>
#includefff <iostream>
#include <vector>

class AddN{
public:
  AddN(int n):num(n){};
  void operator()(int& i){
    i +=num;
  }
private:
  int num;
};

int main(){
  std::cout << std::endl;

  std::vector<int> myVec2{1,2,3,4,5,6,7,8,9,10};
  AddN add4(4);
  std::for_each(myVec2.begin(),myVec2.end(),add4);
  std::cout << std::setw(20) << std::left << "myVec2: i->i+4:     ";
  for (auto v: myVec2) std::cout << std::setw(6) << std::left << v;
  std::cout << "\n";

  std::vector<int> myVec3{1,2,3,4,5,6,7,8,9,10};
  AddN addMinus5(-5);
  std::for_each(myVec3.begin(),myVec3.end(),addMinus5);
  std::cout << std::setw(20) << std::left << "myVec3: i->i-5:     ";
  for (auto v: myVec3) std::cout << std::setw(6) << std::left << v;

  std::cout << "\n\n";
}


Listing 3: Lambda-Funktionen


#include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <vector>


int main(){
  std::cout << std::endl;

  std::vector<int> myVec4{1,2,3,4,5,6,7,8,9,10};
  std::cout << std::setw(20) << std::left << "myVec4: i->3*i+5:   ";
  std::for_each(myVec4.begin(),myVec4.end(),[](int& i){i=3*i+5;});
  for (auto v: myVec4) std::cout << std::setw(6) << std::left << v;
  std::cout << "\n";

  std::vector<int> myVec5{1,2,3,4,5,6,7,8,9,10};
  std::cout << std::setw(20) << std::left << "myVec5: i->i*i   ";
  std::for_each(myVec5.begin(),myVec5.end(),[](int& i){i=i*i;});
  for (auto v: myVec5) std::cout << std::setw(6) << std::left << v;
  std::cout << "\n";

  std::vector<double> myVec6{1,2,3,4,5,6,7,8,9,10};
  std::for_each(myVec6.begin(),myVec6.end(),[](double& i){i=std::sqrt(i);});
  std::cout << std::setw(20) << std::left << "myVec6: i->sqrt(i): ";
  for (auto v: myVec6) std::cout << std::fixed << std::setprecision(2)
<< std::setw(6) << v ;

  std::cout << "\n\n";
}