friend class declaration question

[Alfonso Morra]

Is there a difference between these two:

Decl 1
=============
class A {} ;

class B {
public:
friend class A ;
......
private:
......
};


Decl 2
=============
class A {} ;

class B {
public:
......
private:
friend class A ;
};


Before you ask, I've had a look at parashift and a few other sites, but
this question is not explicitly addressed AFAIK - however, most (all?)
of the code have the friend declaration under the public decl. Is there
a standard/ what(if any) are the implications of either one of the two?

 

[Victor Bazarov]

Is there a difference between these two:

Decl 1
=============
class A {} ;

class B {
public:
friend class A ;
......
private:
......
};


Decl 2
=============
class A {} ;

class B {
public:
......
private:
friend class A ;
};


Before you ask, I've had a look at parashift and a few other sites, but
this question is not explicitly addressed AFAIK - however, most (all?)
of the code have the friend declaration under the public decl. Is there
a standard/ what(if any) are the implications of either one of the two?

None whatsoever. Friendship is not exposed, nor can it be transferred.
Hence there is no difference where (in what access section) the friend
declaration appears.

V

 

[Mercator]

None whatsoever. Friendship is not exposed, nor can it be transferred.
Hence there is no difference where (in what access section) the friend
declaration appears.

Right. Friendship also is an implementation detail of a class. It's
therfore appropriate (but not mandatory) to put it in the private
section.

 

[Alfonso Morra]

Is there a difference between these two:

Decl 1
=============
class A {} ;

class B {
public:
friend class A ;
......
private:
......
};


Decl 2
=============
class A {} ;

class B {
public:
......
private:
friend class A ;
};


Before you ask, I've had a look at parashift and a few other sites, but
this question is not explicitly addressed AFAIK - however, most (all?)
of the code have the friend declaration under the public decl. Is there
a standard/ what(if any) are the implications of either one of the two?

thanks guys

 

[David Harmon]

public:
friend class A ;

private:
friend class A ;

Makes no difference.