C++ Lambdas: capture list vs. parameter list

Question

According to the C++11 standard, lambda expressions may use variables in the enclosing scope, by means of the capture list, the parameter list or both.

So, let\'s look

Answer 1

The point is that with capture, you can keep a state (just as a hand written class with operator() ) in a function-like object. @dau_sama gives a good answer. Here is another example:

#include 
using namespace std;

int main() {

  const auto addSome = [](double some){
    return [some](double val){ return some+val; } ;
  };

  const auto addFive = addSome(5);

  std::cout << addFive(2) << std::endl;
}