title: C++ Hash Deprecation Warning
body: <p>I am very new to C++ and programming in general and am currently working through Bjarne Stroustrup's Programming: Principles and Practices using C++. I'm consistently receiving the error below</p>
  <blockquote>
  <p>Severity  Code    Description Project File    Line Error  C2338   &lt;hash_map&gt; is
  deprecated and will be REMOVED. Please use &lt;unordered_map&gt;. You can
  define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that
  you have received this warning.</p>
  </blockquote>
  <p>I understand that the header file std_lib_facilities.h using some sort of deprecated function, but is there a way to bypass this? It looks like it wants me to define &quot;_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS&quot; but I'm unsure of how to do that. Any help would be appreciated!!</p>