title: Compare ptr with nullptr in gtest
body: <p>Have some code:</p>
  
  <pre><code>EXPECT_NE(nullptr,ptr);
  </code></pre>
  
  <p>And I get the following compilation error:</p>
  
  <pre><code>'operator &lt;&lt;' is ambiguous
  
  could be 'std::basic_ostream&lt;char,std::char_traits&lt;char&gt;&gt; &amp;std::basic_ostream&lt;char,std::char_traits&lt;char&gt;&gt;::operator &lt;&lt;&lt;void&gt;(std::nullptr_t)'
  or       'std::basic_ostream&lt;char,std::char_traits&lt;char&gt;&gt; &amp;testing::internal2::operator &lt;&lt;&lt;char,std::char_traits&lt;char&gt;,T&gt;(std::basic_ostream&lt;char,std::char_traits&lt;char&gt;&gt; &amp;,const T &amp;)'
  </code></pre>
  
  <p>Could this be a library version problem?</p>