title: How to compare special fields in google mock?
body: <p>I have got question connected with google test. I would like to ask if while inducing "EXPECT_CALL(*A, some_method(mes1));" in test case there is possiblity to compare fields included
  in mes1 class.</p>
  
  <pre><code>struct Mes
  {
      int a;
  };
  
  //short section of test case:
  Mes mes1 = Mes();
  EXPECT_CALL(*A, some_method(mes1));
  </code></pre>
  
  <p>I would like to ask if in google mock is a possiblity to compare special fields included in Mes. Something like:</p>
  
  <pre><code>EXPECT_CALL(*A, some_method(mes1), compare(Mes.a));//in this case google mock would compare only field "a" from Mes.
  </code></pre>