title: Model::operator =(cv::dnn::dnn4_v20210301::Model &&)' : is not a special member function which can be defaulted
body: <p>I am new to OpenCV. I was using VS express 2013 for a c++ application that will just load and display some images.</p>
  <p>This is the code that I wrote</p>
  <pre><code>#include &quot;iostream&quot;
  #include &quot;stdio.h&quot;
  #include&quot;opencv2/opencv.hpp&quot;
  using namespace std;
  using namespace cv;
  int main(){
      cout &lt;&lt; &quot;hello world&quot;;  
      Mat image1 = imread(&quot;F:/data/S1.jpg&quot;)
      imshow(&quot;first image&quot;,image1);
      return 0;
  }
  
  </code></pre>
  <p>But when I am running it I am getting this error :</p>
  <pre><code>7   IntelliSense: invalid type for defaulted assignment operator    
  Error   3   error C3646: 'noexcept' : unknown override specifier    
  Error   4   error C3646: 'noexcept' : unknown override specifier    
  Error   6   error C3646: 'noexcept' : unknown override specifier    
  Error   1   error C2610: 'cv::dnn::dnn4_v20210301::Model::Model(cv::dnn::dnn4_v20210301::Model &amp;&amp;)' : is not a special member function which can be defaulted   
  Error   2   error C2610: 'cv::dnn::dnn4_v20210301::Model &amp;cv::dnn::dnn4_v20210301::Model::operator =(cv::dnn::dnn4_v20210301::Model &amp;&amp;)' : is not a special member function which can be defaulted  
  Error   5   error C2610: 'cv::cuda::GpuMatND &amp;cv::cuda::GpuMatND::operator =(cv::cuda::GpuMatND &amp;&amp;)' : is not a special member function which can be defaulted  
  
  </code></pre>
  <p>What is the issue here?</p>