readme.txt

http://www.drdobbs.com/cpp/lambdas-in-c11/240168241

capture.cpp

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
 
int main()
{
  // The user would introduce different values for divisor    
  int divisor = 3;
  vector<int> numbers { 1, 2, 3, 4, 5, 10, 15, 20, 25, 35, 45, 50 };
  for_each(numbers.begin(), numbers.end(),
	   [divisor] (int y)
	   {
	     if (y % divisor == 0)
	       {
		 cout << y << endl;
	       }
	   });
}

ex1.cpp

#include <iostream>
using namespace std;

int main()
{
  auto lambda = [](void) -> void
    {
      cout << "Code within a lambda expression" << endl;
    };
  lambda();
}

ex2.cpp

#include <iostream>
using namespace std;
 
int main()
{
  auto sum = [](int x, int y) { return x + y; };
  cout << sum(5, 2) << endl;
  cout << sum(10, 5) << endl;
}

ex3.cpp

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

bool is_greater_than_5(int value)
{
  return (value > 5);
}
 
int main()
{
  vector<int> numbers { 1, 2, 3, 4, 5, 10, 15, 20, 25, 35, 45, 50 };
  auto greater_than_5_count = count_if
    (numbers.begin(), numbers.end(),
     [](int x) -> bool {return x > 5;});
  cout << "The number of elements greater than 5 is: "
       << greater_than_5_count << "." << endl;
}

ex4.cpp

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
 
void printnumber(int y)
{
  cout << y << endl;
}

struct PrintNumStruct
{
  void operator() (int y)
  {
    cout << y << endl;
  }
} printnumberobject;
 
int main()
{
  vector<int> numbers { 1, 2, 3, 4, 5, 10, 15, 20, 25, 35, 45, 50 };
  for_each(numbers.begin(), numbers.end(),
	   [](int y) -> void
	   {
	     cout << y << endl;
	   });
}

std_function.cpp

#include <iostream>
#include <algorithm>
#include <vector>
#include <functional>
using namespace std;
 
void run_within_for_each(std::function<void (int)> func)
{
  vector<int> numbers{ 1, 2, 3, 4, 5, 10, 15, 20, 25, 35, 45, 50 };
  
  for_each(numbers.begin(), numbers.end(), func);
}
 
int main()
{
  auto func1 = [](int y)
    {
      cout << y << endl;
    };
  
  auto func2 = [](int z)
    {
      cout << z * 2 << endl;
    };
  
  run_within_for_each(func1);
  run_within_for_each(func2);
}