| Title: | C++ |
| Notice: | Read 1.* and use keywords (e.g. SHOW KEY/FULL KIT_CXX_VAX_VMS) |
| Moderator: | DECCXX::AMARTIN |
| Created: | Fri Nov 06 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3604 |
| Total number of notes: | 18242 |
/* When compiled, this program yields the error
friend class _iset; // (2)
...............^
%CXX-E-REFENCLOSING, In this declaration, "_iset" has a declaration in an
enclosing scope, and this class declaration contains a reference to that
declaration.
If you delete the lines marked (1) (i.e., make it an ordinary class instead of a
template class), it compiles successfully. Also, if you interchange the lines
marked (2), it compiles successfully.
Explanation, please?
-Neil
*/
template <class Key> // (1)
class _iset {
public:
class iterator {
const _iset* set; // (2)
friend class _iset; // (2)
};
};
void main()
{
_iset
<int> // (1)
x;
}
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3463.1 | SPECXN::DERAMO | Dan D'Eramo | Mon Feb 24 1997 20:33 | 12 | |
It will probably work if you change
friend class _iset;
to
friend class _iset<Key>;
Don't know whether the latest draft of the standard-to-be
requires the <Key> to be there.
Dan
| |||||
| 3463.2 | I think it's a bug... | DECC::J_WARD | Tue Feb 25 1997 12:03 | 8 | |
Section 14.6.1 of the standard: "Within the scope of a class template, the name of the template, when not followed by <, is equivalent to the name of the template followed by the template-parameters enclosed in <>. | |||||
| 3463.3 | a related problem: %CXX-E-INACCESSIBLE | MOIRA::FAIMAN | Tue Feb 25 1997 17:30 | 33 | |
/*
In .0, I stated that interchanging the two lines marked (2) allowed the test
program to compile successfully. It appears from the following that it was only
partially successful. I have interchanged those two lines, but added code in
the _iset class which invokes the private constructor of the iterator class.
_iset ought to be a friend of iterator now; but compiling this program yields
void foo(float k) {iterator i(k);}
.................................^
%CXX-E-INACCESSIBLE, In this declaration, "_iset<int >::iterator::iterator" is
not accessible.
As before, removing the lines marked (1) (i.e., making _iset an ordinary class
rather than a template class) eliminates the problem.
*/
template <class Key> // (1)
class _iset {
public:
class iterator {
friend class _iset; // (2)
const _iset* set; // (2)
iterator(float);
};
void foo(float k) {iterator i(k);}
};
void main()
{
_iset
<int> // (1)
x;
}
| |||||
| 3463.4 | MOIRA::FAIMAN | Tue Feb 25 1997 17:36 | 6 | ||
The problem reports in .0 and .3 were based on DEC C++ V5.4 on VAX/VMS. I just confirmed that the problem in .0 occurs with V5.5 on Alpha/VMS and on Alpha/Unix. Oddly enough, the problem in .3 occurs with V5.5 on Alpha/Unix, but *not* with V5.5 on Alpha/VMS. -Neil | |||||