title: error: ‘std::enable_if_t’ has not been declared
body: <p>Currently, I am having issue with this line of code. Its showing this error message <code>error: ‘std::enable_if_t’ has not been declared</code>. I have included the <code>#include &lt;type_traits&gt;</code> header file but its still the same. Below is my src code:</p>
  
  <pre><code>template&lt;class T&gt;
  std::string toJSON(const T&amp; o,std::enable_if_t&lt;detail::hasBindFunction&lt;T&gt;::value&gt;* =nullptr)
  </code></pre>
  
  <p>I have added the c++ version into my binding.gyp file. <code>"cflags": [ "-std=c++14" ],</code>. Still the error shows there.</p>
  
  <p>Can I know how to fix this error.</p>