Re: g++ 3.3.2 '?:' operator compile error

[Thomas Maeder]

Kyuso Cahi <kyuso@softhome.net> writes:

> I have the following code that gives an error during compile:
>
> // xxx.cc
> class A {
>  public:
>   static const int YES=1;
>   static const int NO=-1;
> };
>
> int main() {
>   double n=3.0;
>   if (A::YES > A::NO); // line 9
>   return (n>0.0) ? (A::YES) : (A::NO); // line 10
> }
>
> ---after g++ 3.3.2 compiling--
> /tmp/ccCrBdd3.o(.text+0x33): In function `main':
> xxx.cc:10: undefined reference to `A::YES'
> /tmp/ccCrBdd3.o(.text+0x3d):xxx.cc:10: undefined reference to `A::NO'

Looks more like a linker error.


The program has undefined behavior: A::YES and A::NO are declared, but not
defined. What happens if you add

int const A::YES;
int const A::NO;

to the global namespace someplace after the definition of A?