title: Is std::hash guaranteed to be same across stdlib distributions
body: <p>If I did <code>std::hash</code> using <code>libstdc++</code> and then did one on the upcoming <code>C++11</code> VS 2012 library - would they match?</p>
  
  <p>I assume that hash implementations are not part of the C++ specification and can vary by distribution?</p>