«

Hello, I am having trouble to properly construct the 'show' function
definition. g++ 4.1.1 is giving me error messages but intel c++ compiler
compiles it fine. Which one is correct?

Fei

#include <iostream>
using namespace std;

template <typename T>
struct C{
struct S{
T x;
};

S s;
S show();
};

template <typename T>
C<T>::S C<T>::show(){
cout << s.x << '\n';
return s;
}

int main(){

C<int> c;
c.show();
}
~


~


~

Fei Liu wrote:
> Hello, I am having trouble to properly construct the 'show' function
> definition. g++ 4.1.1 is giving me error messages but intel c++
> compiler compiles it fine. Which one is correct?
>
> Fei
>
> #include <iostream>
> using namespace std;
>
> template <typename T>
> struct C{
> struct S{
> T x;
> };
>
> S s;
> S show();
> };
>
> template <typename T>
> C<T>::S C<T>::show(){
> cout << s.x << '\n';
> return s;
> }
>
> int main(){
>
> C<int> c;
> c.show();
> }
> ~

Seems fine to me. What error do you get from gcc?

BTW, Comeau online accepts it as well.

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

Victor Bazarov wrote:
> Fei Liu wrote:
>> Hello, I am having trouble to properly construct the 'show' function
>> definition. g++ 4.1.1 is giving me error messages but intel c++
>> compiler compiles it fine. Which one is correct?
>>
>> Fei
>>
>> #include <iostream>
>> using namespace std;
>>
>> template <typename T>
>> struct C{
>> struct S{
>> T x;
>> };
>>
>> S s;
>> S show();
>> };
>>
>> template <typename T>
>> C<T>::S C<T>::show(){
>> cout << s.x << '\n';
>> return s;
>> }
>>
>> int main(){
>>
>> C<int> c;
>> c.show();
>> }
>> ~
>
> Seems fine to me. What error do you get from gcc?
>
> BTW, Comeau online accepts it as well.
>
> V

g++ -fstrict-aliasing -fomit-frame-pointer -Wall -pedantic -ansi -g -O0
-o templ_inner_class.o -c templ_inner_class.cpp
templ_inner_class.cpp:15: error: expected constructor, destructor, or
type conversion before ‘C’
gcc version 4.1.2 20061115 (prerelease)

Fei Liu wrote:
> Victor Bazarov wrote:
>> Fei Liu wrote:
>>> Hello, I am having trouble to properly construct the 'show' function
>>> definition. g++ 4.1.1 is giving me error messages but intel c++
>>> compiler compiles it fine. Which one is correct?
>>>
>>> Fei
>>>
>>> #include <iostream>
>>> using namespace std;
>>>
>>> template <typename T>
>>> struct C{
>>> struct S{
>>> T x;
>>> };
>>>
>>> S s;
>>> S show();
>>> };
>>>
>>> template <typename T>
>>> C<T>::S C<T>::show(){
>>> cout << s.x << '\n';
>>> return s;
>>> }
>>>
>>> int main(){
>>>
>>> C<int> c;
>>> c.show();
>>> }
>>> ~
>>
>> Seems fine to me. What error do you get from gcc?
>>
>> BTW, Comeau online accepts it as well.
>>
>> V
>
> g++ -fstrict-aliasing -fomit-frame-pointer -Wall -pedantic -ansi -g
> -O0 -o templ_inner_class.o -c templ_inner_class.cpp
> templ_inner_class.cpp:15: error: expected constructor, destructor, or
> type conversion before 'C'
> gcc version 4.1.2 20061115 (prerelease)

Perhaps a 'typename' would silence it:

template <typename T>
typename // this here
C<T>::S C<T>::show(){ ...

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

Victor Bazarov wrote:
> Fei Liu wrote:
>> Victor Bazarov wrote:
>>> Fei Liu wrote:
>>>> Hello, I am having trouble to properly construct the 'show' function
>>>> definition. g++ 4.1.1 is giving me error messages but intel c++
>>>> compiler compiles it fine. Which one is correct?
>>>>
>>>> Fei
>>>>
>>>> #include <iostream>
>>>> using namespace std;
>>>>
>>>> template <typename T>
>>>> struct C{
>>>> struct S{
>>>> T x;
>>>> };
>>>>
>>>> S s;
>>>> S show();
>>>> };
>>>>
>>>> template <typename T>
>>>> C<T>::S C<T>::show(){
>>>> cout << s.x << '\n';
>>>> return s;
>>>> }
>>>>
>>>> int main(){
>>>>
>>>> C<int> c;
>>>> c.show();
>>>> }
>>>> ~
>>> Seems fine to me. What error do you get from gcc?
>>>
>>> BTW, Comeau online accepts it as well.
>>>
>>> V
>> g++ -fstrict-aliasing -fomit-frame-pointer -Wall -pedantic -ansi -g
>> -O0 -o templ_inner_class.o -c templ_inner_class.cpp
>> templ_inner_class.cpp:15: error: expected constructor, destructor, or
>> type conversion before 'C'
>> gcc version 4.1.2 20061115 (prerelease)
>
> Perhaps a 'typename' would silence it:
>
> template <typename T>
> typename // this here
> C<T>::S C<T>::show(){ ...
>
> V
Yeap, this is the fix for g++, thanks!

Fei