Declare C function as friend inside CPP class

Question

I need to use a private class variable inside a C function. I was doing something like this

class Helper
{
private:
    std::string name;
public:
    std::getName(){return name;}
friend extern "C" void initializeHelper();
};

but this code segment gives error unqualified-id before string constant extern "C" {

I cannot determine what I am doing wrong here.

+2

rajenpandit 15 Mar '15 at 9:18

1 answer

PiotrNycz · Accepted Answer · 2015-03-15T09:36:59+0000

Just forward this function before the class:

extern "C" void foo();

Then you can use it in your friend's declaration:

class A {
public:
  A() {}
private:
  friend void foo();
  int a;
};