* gcc template error?
@ 2005-06-22 17:58 Shelly Adhikari
2005-06-22 18:14 ` Andrew Pinski
0 siblings, 1 reply; 4+ messages in thread
From: Shelly Adhikari @ 2005-06-22 17:58 UTC (permalink / raw)
To: gcc
Hello Guys,
Thw following program is giving an error. Is the program incorrect (If
possible, please cite relevant sections from the C++ standard)? Should I
file a bug?
% /usr/local/gcc-4.0.0/bin/g++ template.cxx
template.cxx: In function 'T<X>* func(T<Y>*) [with X = B, Y = A]':
template.cxx:36: instantiated from here
template.cxx:21: error: 'A* T<A>::m_' is private
template.cxx:30: error: within this context
// Line 1
class A {
public:
A() { };
~A() { };
};
class B {
public:
B();
B(const A& a) { };
~B();
};
template <typename X> class T;
template <typename X, typename Y>
T<X>* func(T<Y>* p);
template <typename X> class T {
X* m_;
public:
T(X* x) : m_(x) { };
~T() { };
friend T<class Y>* func<Y, X>(T<X>* p);
};
template <typename X, typename Y>
T<X>* func(T<Y>* p) {
return (new T<X>(new X(*p->m_)));
}
int main() {
A* a = new A();
T<A>* p = new T<A>(a);
T<B>* q = func<B, A>(p);
return 0;
}
Best Regards,
Shelly
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: gcc template error?
2005-06-22 17:58 gcc template error? Shelly Adhikari
@ 2005-06-22 18:14 ` Andrew Pinski
0 siblings, 0 replies; 4+ messages in thread
From: Andrew Pinski @ 2005-06-22 18:14 UTC (permalink / raw)
To: Shelly Adhikari; +Cc: gcc
On Jun 22, 2005, at 1:56 PM, Shelly Adhikari wrote:
> Hello Guys,
>
> Thw following program is giving an error. Is the program incorrect (If
> possible, please cite relevant sections from the C++ standard)? Should
> I file a bug?
I don't know if this is valid C++ or not but on the mainline we ICE so
I filed
PR 22147.
-- Pinski
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: gcc template error?
2005-06-22 19:31 Jason Mancini
@ 2005-06-22 19:41 ` Shelly Adhikari
0 siblings, 0 replies; 4+ messages in thread
From: Shelly Adhikari @ 2005-06-22 19:41 UTC (permalink / raw)
To: Jason Mancini; +Cc: gcc
Jason Mancini wrote:
> I suspect this line is the source of your problems:
> friend T<class Y>* func<Y, X>(T<X>* p);
> Y isn't a template parameter here, but a (concrete?) class named "Y".
> The below compiles with 3.4.3 anyways...
> Regards,
> -Jason
Yep, that line is the source of my problems.
Can you send me a pointer to the C++ standard which says what you are
saying?
Two template parameters are not acceptable in my situation. I would have
to find another solution.
Best Regards,
Shelly
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: gcc template error?
@ 2005-06-22 19:31 Jason Mancini
2005-06-22 19:41 ` Shelly Adhikari
0 siblings, 1 reply; 4+ messages in thread
From: Jason Mancini @ 2005-06-22 19:31 UTC (permalink / raw)
To: gcc; +Cc: shelly
I suspect this line is the source of your problems:
friend T<class Y>* func<Y, X>(T<X>* p);
Y isn't a template parameter here, but a (concrete?) class named "Y".
The below compiles with 3.4.3 anyways...
Regards,
-Jason
// Line 1
class A {
public:
A() { };
~A() { };
};
class B {
public:
B();
B(const A& a) { };
~B();
};
template <typename X, typename Y> class T;
template <typename X, typename Y>
T<X,Y>* func(T<X,Y>* p);
template <typename X, typename Y> class T {
X* m_;
public:
T(X* x) : m_(x) { };
~T() { };
friend T<X,Y>* func<X,Y>(T<X,Y>* p);
};
template <typename X, typename Y>
T<X,Y>* func(T<X,Y>* p) {
return (new T<X,Y>(new X(*p->m_)));
}
int main() {
A* a = new A();
T<A,B>* p = new T<A,B>(a);
T<A,B>* q = func<A, B>(p);
return 0;
}
^ permalink raw reply [flat|nested] 4+ messages in thread
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2005-06-22 17:58 gcc template error? Shelly Adhikari
2005-06-22 18:14 ` Andrew Pinski
2005-06-22 19:31 Jason Mancini
2005-06-22 19:41 ` Shelly Adhikari
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