title: escape R"()" in a raw string in C++
body: <pre><code>  string raw_str = R"(R"(foo)")";
  </code></pre>
  
  <p>If I have <code>R"()"</code> inside a raw string, and that causes the parser to confuse. (ie., it thought the left most <code>)"</code> was the end of the raw string.</p>
  
  <p>How do I escape this?</p>