* address of overloaded function with no contextual type information
@ 2010-08-11 21:09 Adam Burr
2010-08-11 21:45 ` Tiago Maluta
0 siblings, 1 reply; 5+ messages in thread
From: Adam Burr @ 2010-08-11 21:09 UTC (permalink / raw)
To: gcc-help
Does anyone know what I'm doing wrong here?
#include <iostream>
template< typename T >
struct thingA
{
template< int I >
static int doA () {return I;}
struct thingB
{
void doB ()
{
// this line does not compile:
int (*doAPtr) () = &thingA< T >::doA< 2 >;
std::cerr << (*doAPtr) () << std::endl;
}
};
};
int main (int, char **)
{
thingA< int >::thingB a;
a.doB ();
}
This is a contrived example but in the "real world" I do need to get a
pointer to a static template function inside a template class like this.
Here is the gcc error:
main.cc: In member function 'void thingA<T>::thingB::doB()':
main.cc:14: error: expected primary-expression before ';' token
main.cc: In member function 'void thingA<T>::thingB::doB() [with T = int]':
main.cc:23: instantiated from here
main.cc:14: error: address of overloaded function with no contextual
type information
Any help is appreciated.
Thanks,
Adam Burr
Blue Sky Studios
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: address of overloaded function with no contextual type information
2010-08-11 21:09 address of overloaded function with no contextual type information Adam Burr
@ 2010-08-11 21:45 ` Tiago Maluta
2010-08-11 21:50 ` Adam Burr
0 siblings, 1 reply; 5+ messages in thread
From: Tiago Maluta @ 2010-08-11 21:45 UTC (permalink / raw)
To: Adam Burr; +Cc: gcc-help
Hi Adam,
Change the line:
> int (*doAPtr) () = &thingA< T >::doA< 2 >;
To:
int (*doAPtr)() = &thingA< int >::doA< 2 >;
--tm
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: address of overloaded function with no contextual type information
2010-08-11 21:45 ` Tiago Maluta
@ 2010-08-11 21:50 ` Adam Burr
2010-08-11 21:57 ` Tiago Maluta
0 siblings, 1 reply; 5+ messages in thread
From: Adam Burr @ 2010-08-11 21:50 UTC (permalink / raw)
To: Tiago Maluta; +Cc: gcc-help
Tiago Maluta wrote:
> Hi Adam,
>
> Change the line:
>
>> int (*doAPtr) () = &thingA< T >::doA< 2 >;
>>
>
> To:
> int (*doAPtr)() = &thingA< int >::doA< 2 >;
>
> --tm
>
Yes, that works but it isn't what I need. Luckily I just figured it out!
That line should be:
int (*doAPtr) () = &thingA< T >::template doA< 2 >;
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: address of overloaded function with no contextual type information
2010-08-11 21:50 ` Adam Burr
@ 2010-08-11 21:57 ` Tiago Maluta
2010-08-11 22:08 ` Adam Burr
0 siblings, 1 reply; 5+ messages in thread
From: Tiago Maluta @ 2010-08-11 21:57 UTC (permalink / raw)
To: Adam Burr; +Cc: gcc-help
On Wed, Aug 11, 2010 at 9:50 PM, Adam Burr <adamb@blueskystudios.com> wrote:
> Tiago Maluta wrote:
>>
>> Hi Adam,
>>
>> Change the line:
>>
>>>
>>> int (*doAPtr) () = &thingA< T >::doA< 2 >;
>>>
>>
>> To:
>> int (*doAPtr)() = &thingA< int >::doA< 2 >;
>>
>
> Yes, that works but it isn't what I need. Luckily I just figured it out!
> That line should be:
>
> int (*doAPtr) () = &thingA< T >::template doA< 2 >;
>
>
I dind't know that construction, thanks.
--tm
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: address of overloaded function with no contextual type information
2010-08-11 21:57 ` Tiago Maluta
@ 2010-08-11 22:08 ` Adam Burr
0 siblings, 0 replies; 5+ messages in thread
From: Adam Burr @ 2010-08-11 22:08 UTC (permalink / raw)
To: Tiago Maluta; +Cc: gcc-help
Tiago Maluta wrote:
> On Wed, Aug 11, 2010 at 9:50 PM, Adam Burr <adamb@blueskystudios.com> wrote:
>
>> Tiago Maluta wrote:
>>
>>> Hi Adam,
>>>
>>> Change the line:
>>>
>>>
>>>> int (*doAPtr) () = &thingA< T >::doA< 2 >;
>>>>
>>>>
>>> To:
>>> int (*doAPtr)() = &thingA< int >::doA< 2 >;
>>>
>>>
>> Yes, that works but it isn't what I need. Luckily I just figured it out!
>> That line should be:
>>
>> int (*doAPtr) () = &thingA< T >::template doA< 2 >;
>>
>>
>>
>
> I dind't know that construction, thanks.
>
> --tm
>
Thanks to John Love-Jensen:
http://gcc.gnu.org/ml/gcc-help/2006-04/msg00023.html
(Sorry for not finding it before posting, I thought I had searched
exhaustively.)
^ permalink raw reply [flat|nested] 5+ messages in thread
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2010-08-11 21:09 address of overloaded function with no contextual type information Adam Burr
2010-08-11 21:45 ` Tiago Maluta
2010-08-11 21:50 ` Adam Burr
2010-08-11 21:57 ` Tiago Maluta
2010-08-11 22:08 ` Adam Burr
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