(C++) std::endl

std::endl is an output stream modifier to go to the next line and flush the stream's buffer.

#include <iostream>  

int main() 
{   
  //Go to next line and flush the std::cout buffer   
  std::cout << std::endl; 
}

The code above is equivalent to the code below [2]:

#include <iostream>  

int main() 
{   
  //Go to next line   
  std::cout << '\n';   
  //Flush the std::cout buffer   
  std::cout.flush(); 
}

Advice

Avoid std::endl [1,3], as one does not need to flush the std::cout buffer after every output [2].

[1] C++ Core Guidelines: SL.io.50: Avoid endl
[2] Angelika Langer, Klaus Kreft. Standard C++ IOStreams and Locales. 1999. ISBN:0-321-58558-5. Chapter 1.2.4, section 'Manipulators', page 23
[3] C++ Weekly - Ep7 Stop Using std::endl