Template inheritance comile problem

[Helge]

I have a prbl. cannot seem to compile this simple code: (might this be a
bug?)

gcc version 4.1.2

//Begin code

template <class T>
class FirstClass{
public:
T a;
};

template <class T>
class SecondClass : public FirstClass<T>{
public:
T func(){return a;}
};

int main(){}

//End Code

Compiler

test.cpp: In member function ‘T SecondClass<T>: :func()’:
test.cpp:10: error: ‘a’ was not declared in this scope

[Gianni Mariani]

Re: Template inheritance comile problem

Helge wrote:

I have a prbl. cannot seem to compile this simple code: (might this be a
bug?)
>
gcc version 4.1.2
>
//Begin code
>
template <class T>
class FirstClass{
public:
T a;
};
>
template <class T>
class SecondClass : public FirstClass<T>{
public:
T func(){return a;}

try this line:
T func(){return this->a;}

};
>
int main(){}
>
//End Code
>
Compiler
>
test.cpp: In member function ‘T SecondClass<T>: :func()’:
test.cpp:10: error: ‘a’ was not declared in this scope

[John Harrison]

Re: Template inheritance comile problem

Helge wrote:

I have a prbl. cannot seem to compile this simple code: (might this be a
bug?)
>
gcc version 4.1.2
>
//Begin code
>
template <class T>
class FirstClass{
public:
T a;
};
>
template <class T>
class SecondClass : public FirstClass<T>{
public:
T func(){return a;}
};
>
int main(){}
>
//End Code
>
Compiler
>
test.cpp: In member function ‘T SecondClass<T>: :func()’:
test.cpp:10: error: ‘a’ was not declared in this scope

Gianni told you the answer, but no it isn't a bug. It's 'two phase
lookup', a complicated subject. Try googling if you want more enlightenment.

john

[Grizlyk]

Re: Template inheritance comile problem

John Harrison wrote:

>>
>template <class T>
>class SecondClass : public FirstClass<T>{

using FirstClass<T>:: a;

>public:
> T func(){return a;}
>};

>
Gianni told you the answer, but no it isn't a bug. It's 'two phase
lookup', a complicated subject. Try googling if you want more
enlightenment.

http://www.parashift.com/c++-faq-lite/templates.html#faq-35.19

--
Maksim A. Polyanin

http://grizlyk1.narod.ru/cpp_new

"In thi world of fairy tales rolls are liked olso"
/Gnume/