Proper initialization of static constexpr array in class template?

Question

Static class members in C++ have caused a little confusion for me due to the standard\'s verbiage:

9.4.2 Static data members [class.sta

Answer 1

In case it helps anyone out, the following worked for me with GCC 4.7 using constexpr:

template class X {
  constexpr static int s = 0;
};
template constexpr int X::s; // link error if this line is omitted

I'm not making any claims of whether this is "proper". I'll leave that to those more qualified.