title: C++11 STL containers and thread safety
body: <p>I have trouble finding any up-to-date information on this.</p>
  
  <p>Do C++11 versions of STL containers have some level of thread safety guaranteed?</p>
  
  <p>I do expect that they don't, due to performance reasons. But then again, that's why we have both <a href="http://en.cppreference.com/w/cpp/container/vector/operator_at" rel="noreferrer"><code>std::vector::operator[]</code></a> and <a href="http://en.cppreference.com/w/cpp/container/vector/at" rel="noreferrer"><code>std::vector::at</code></a>.</p>