__is_empty() recognizes empty unions

[ipapadop]

Hi,

The following code works fine

[cpp]#include 
union empty_union { };

int main()
{
  assert(__is_empty(empty_union));
  return 0;
}[/cpp]

However, according to the latest ISO C++ 0x draft, std::is_empty should not recognize empty unions. GCC's __is_empty does not recognize empty unions as well.

Is this intentional or a bug?

Thanks

[Milind_Kulkarni__Int]

I hope you compiled with g++ 4.3.x and later, as probably __is_empty does not work (and is not recognized and gives error) with 4.2.x or lower, could be due to c++0x features and functions.

I reproduced your problem, the icc & gcc give different result with __is_empty .

I would escalate it as a bug.

regards

[ipapadop]

Quoting Milind Kulkarni (Intel)

I hope you compiled with g++ 4.3.x and later, as probably __is_empty does not work (and is not recognized and gives error) with 4.2.x or lower, could be due to c++0x features and functions.

I reproduced your problem, the icc & gcc give different result with __is_empty .

I would escalate it as a bug.

regards

I used gcc 4.4.4

[Milind_Kulkarni__Int]

yes, i meant g++ 4.3.x or later, and that includes g++ 4.4.4, so It should be escalated and fixed.