nw wrote:
Quote:
Hi comp.lang.c++,
>
I have the following header (simple.h):
>
#ifndef SIMPLE
#define SIMPLE
>
template<class _prec=double>
class Simple {
>
public:
>
Simple() {
}
>
Simple<_precnext;
};
>
#endif
>
and c++ file:
>
#include <iostream>
#include "simple.h"
>
using namespace std;
>
int main() {
Simple<doubles;
}
>
>
Compilation gives me the error:
>
simple.h: In instantiation of 'Simple<double>':
simple.cpp:7: instantiated from here
simple.h:12: error: 'Simple<_prec>::next' has incomplete type
simple.h:5: error: declaration of 'class Simple<double>'
>
under g++ 4.1.2. I guess I need to add a prototype for Simple, but I
can't quite see how to do this for a template class. Any help
appreciated!
You cannot do this. Declare next as a pointer or reference type (and
make sure the pointee is always valid of course during runtime).
Fei
