Re: C++ problem

[Shachar Shemesh]

Oleg Goldshmidt wrote:
Oleg Goldshmidt <[EMAIL PROTECTED]> writes:
 

I stand by my posting so far. 
   

Well, while it was making the round trip to the list and back, I also
made a trip to the bookshelf to check myself. Item 15 of Scott
Meyers's "Effective C++" confirms what I wrote: temps are const, and
for the reasons I covered. It explicitly says that with a declaration
like
     C& C::operator=(C& rhs) { ... }
client code won't compile.
 

Then you haven't understood my "dual existence" statement. Try out the 
following program:

#include <iostream>
using namespace std;
class a {
public:
    void function() const {
        cout<<"Const version called"<<endl;
    }
    void function() {
        cout<<"Non-const version called"<<endl;
    }
    static void func2( const a & ) {
        cout<<"Called with const reference"<<endl;
    }
    static void func2( a & ) {
        cout<<"Called with non-const reference"<<endl;
    }
};
int main()
{
    a().function();
    a::func2(a());
    return 0;
}
A temp is a non-const, but it cannot be bound to a non-const reference. 
I don't like it, but that seems to be the case.

As for my original problem, upon retrospect (and a good night's sleep), 
I think that using "mutable" on the "owner" flag will be a better, 
cleaner, solution than using a proxy class.

Scott knows his stuff _much_ better than I do.
But the "Effective" series is fairly old. Older than the C++ ISO standard.
moreover, it is
entirely possible (though I don't remember) that I learned that the
rhs of the assignment should be const from his books.
I know for a fact I did. However, this is for cases where you don't want 
to change the right side. In my case, as explained, I do want to change 
the right side. Still, as I wrote above, mutable would probably serve my 
needs better than the ugly hack.

I don't know if
"Effective C++" is available on-line, so no URL.
 

While I don't have it, I did read both "Effective" and "More effective". 
Like I said, however, the only true source is the ISO standard, which 
is, sadly, not online (that I know of).

         Shachar
--
Shachar Shemesh
Lingnu Open Source Consulting ltd.
http://www.lingnu.com/
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