Reading a boost::property_tree::ptree recursively and make it an URL query string

string readPropertyTreeRecursive( boost::property_tree::ptree& rptree, string& prefix )
{
  // Leaf
  string ret;
  if( rptree.size() == 0 )
  {
    ret = prefix + "=" + rptree.data() + "&";
    return ret;
  }
  // Subtree
  else
  {
    BOOST_FOREACH( boost::property_tree::ptree::value_type& child, rptree )
    {
      string subprefix;

      // Avoid adding a leading dot
      if( !prefix.empty() )
        subprefix = prefix + std::string( "." ) + child.first.data();
      else
        subprefix = child.first.data();

      // Build up return string recursively
      ret += readPropertyTreeRecursive( child.second, subprefix );
    }
  }
  return ret;
}
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Date posted:	Mon, 19 Nov 2012 10:48:40 +0000
Date of expiration:	never (permanent entry)
Description:	Reading a boost::property_tree::ptree recursively and make it an URL query string