Is _ (single underscore) a valid C++ variable name?

Question

With gcc 4.7.2 this compiles just fine for me:

int main()
{
  int _ = 1;
  return 0;
}

Can I expect this to compile in general? I\'ve read

Answer 1

Yes. a single _ will be accepted as variable or any identifier/namespace name! E.g. google mock uses this.