C++ Lambda capture private class member

Question

Here is a part of my Class:

//...
        bool dump_dvars()
        {
            fstream& refvar{ output_file };

            for_each(_array_start, _array_         


        

Answer 1

You should capture 'this' in the lambda.

The following code compiles and works just fine with g++, clang, VS2010 and VS2013.

#include <iostream>

class A
{
public:
    A() : x(5){}
    void f() const
    {
        ([this]()
        {
            std::cout << x << std::endl;
        })();
    }
private:
    int x;
};

int main()
{
    A a;
    a.f();
}