Question

I am compiling this code with g++ version 3.4.4 on windows:-

#include <iostream>

template< int i >
class LOOP{
 public:
    static inline void EXEC(int* count){
        (*count)++;
            LOOP< i-1 >::EXEC(count);
   }
};

template<> class LOOP< 0 >{
  public:
    static inline void EXEC(int* count){
   (*count)++;
   }
};

 int main(int i){

int barely = 0;
LOOP< 1000 >::EXEC(&barely);
 }

It complains, incomplete type LOOP<500> used in nested name specifier and has a list of the previous instantiations before it, “instantiated from static void LOOP::EXEC(int *) with i – 1000” and so on.

When I change it to LOOP<100> it compiles fine though.

EDIT I am running this on cygwin if that affects the implementation limits.

Answer 1

You hit the implementation’s template depth limit. You can increase the limit by compiling with -ftemplate-depth=1005 (modern GCC) or -ftemplate-depth-1005 (older GCC).