selfpointer inside template friend function

Asked Jan 12 '18 at 13:18

Active Jan 12 '18 at 13:33

Viewed 43 times

How can I get pointer to object in friend function?

def.h

class A
{
public:
     template <typename some_type_t>
     friend void foo(some_type_t &val);

     A();
     virtual ~A();    
private:
     int x;
     inline A* GetSelfPtr(){return this;}
};

class B
{
public:
      template <typename some_type_t>
      friend void foo(some_type_t &val);

      B();
      virtual ~B();    
private:
      int x;
      inline B* GetSelfPtr(){return this;} 
};
#include "templt.h"

templt.h

template <typename some_type_t>
void foo(some_type_t &val)
{
     GetSelfPtr()->x;
}

error: there are no arguments to ‘GetReqPtr’ that depend on a template parameter, so a declaration of ‘GetReqPtr’ must be available [-fpermissive]

edited Jan 12 '18 at 13:33

asked Jan 12 '18 at 13:18

HeyHo

Which self do you want? The function is a friend of the whole class, to call a method you still need an instance that has to come from somewhere – 463035818_is_not_an_ai Jan 12 '18 at 13:23
`GetSelfPtr()` is a method. not a function. is is private. it is not called on an object. Does this point you in a direction? – R4PH43L Jan 12 '18 at 13:25
1

Do you want `template friend void foo(B& b, T&val);` instead ? – Jarod42 Jan 12 '18 at 13:31
Btw, your `template ` is invalid, `typename` is missing. – Jarod42 Jan 12 '18 at 13:32
I don't want to do add foo() in every class. – HeyHo Jan 12 '18 at 13:35
smells like a [xy problem](https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem). What is `foo` actually supposed to be good for? Btw I guess you meant you want to add foo to every class but not type the code for every class?!? – 463035818_is_not_an_ai Jan 12 '18 at 13:39
Are you looking for `val.GetSelfPtr()->x`? – Quentin Jan 12 '18 at 14:05

selfpointer inside template friend function

0 Answers0