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pocmatos@gmail.com
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 Posted: Mon Nov 28, 2005 9:41 am Post subject: Const Friend? |
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Hi all,
Is it possible to declare a const friend or something. I wish to make
class B friend of class A but I don't want it to be changing A. It's a
read-only friend. Is this possible?
Thanks,
Paulo Matos
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Zara
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| Posted: Mon Nov 28, 2005 10:34 am Post subject: Re: Const Friend? |
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On 28 Nov 2005 01:41:02 -0800, [email]pocmatos (AT) gmail (DOT) com[/email] wrote:
| Quote: | Hi all,
Is it possible to declare a const friend or something. I wish to make
class B friend of class A but I don't want it to be changing A. It's a
read-only friend. Is this possible?
Thanks,
Paulo Matos
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class A {
/*...*/
friend class B;
/*...*/
};
class B {
/*...*/
void function(const class A& what)
{
/* this is the function that accesses A, only through what reference
and not using const_cast */}
};
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Neil Cerutti
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| Posted: Mon Nov 28, 2005 2:11 pm Post subject: Re: Const Friend? |
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On 2005-11-28, [email]pocmatos (AT) gmail (DOT) com[/email] <pocmatos (AT) gmail (DOT) com> wrote:
| Quote: | Is it possible to declare a const friend or something. I wish
to make class B friend of class A but I don't want it to be
changing A. It's a read-only friend. Is this possible?
|
Include an in-between friend that provides the access for the
members you want to share.
class A {
int x, y;
friend class B;
};
class B {
const int &x() const { return A: ; }
const int &y() const { return A::y; }
/* If they're really built-in types, you wouldn't necessarily use
references. But in general, you would. */
friend class C;
};
class C {
// Must use B:() and B::y() to access A: and A::y.
};
--
Neil Cerutti
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