how to declare this template operator?

[Patricia]

Hi all,

What is wrong with my following codes?
//SortedListOfEvents.hh
....
line 45: template < class Element > class SortedListOfEvents {
....
line 50: template <class Element>
friend ostream& operator << (ostream&, const
SortedListOfEvents < Element > &);

public:
....
private:
....
}

I always got the error messages like:

"SortedListOfEvents.hh": SortedListOfEvents.hh error: declaration of
'class Element' at line 50
"SortedListOfEvents.hh": SortedListOfEvents.hh error: shadows template
parm 'class Element' at line 45
Many thanks,

Patricia

[mlimber]

Patricia wrote:

Hi all,

What is wrong with my following codes?
//SortedListOfEvents.hh
...
line 45: template < class Element > class SortedListOfEvents {
...
line 50: template <class Element>
friend ostream& operator << (ostream&, const
SortedListOfEvents < Element > &);

public:
....
private:
....
}

I always got the error messages like:

"SortedListOfEvents.hh": SortedListOfEvents.hh error: declaration of
'class Element' at line 50
"SortedListOfEvents.hh": SortedListOfEvents.hh error: shadows template
parm 'class Element' at line 45
Many thanks,

Patricia

The problem is that you use the same template parameter name (viz.
Element) in both your class and your function. However, even if you
fixed that by renaming the friend function's template parameter
"Element2", it wouldn't link. See this FAQ for the solution:

http://www.parashift.com/c++-faq-lit...html#faq-35.16

Cheers! --M

[Patricia]

The strange thing is these codes were compiled successfully by Sun CC.
Does the error depends on the compiler?

[mlimber]

Patricia wrote:

The strange thing is these codes were compiled successfully by Sun CC.
Does the error depends on the compiler?

Please quote the message you are replying to. It makes things easier to
follow for those not using Goggle Groups. (To quote in Google Groups,
click on "show options" and then on "Reply" in the revealed header.)

Which code (note the singular) are you referring to? If the code with
Element2, did it *link* after compiling?

Cheers! --M