title: Get value from json using ptree in c++ if key name is with dots(.)
body: <p>I tried using ptree to fetch value of key in c++ for key name having multiple . in keys.</p>
  
  <p>so I have json,</p>
  
  <pre><code>"product": {
      "product.description.text": "Some text here"
  }
  </code></pre>
  
  <p>I tried calling</p>
  
  <pre><code>std::string product = pt.get_value("product.product.description.text");
  </code></pre>
  
  <p>but can't get value.
  please help me</p>