Code cleanup: use empty() to check size() == 0

src/DHTBucket.cc

@@ -143,7 +143,7 @@ void DHTBucket::cacheNode(const SharedHandle<DHTNode>& node)
 
 void DHTBucket::dropNode(const SharedHandle<DHTNode>& node)
 {
-  if(cachedNodes_.size()) {
+  if(!cachedNodes_.empty()) {
     std::deque<SharedHandle<DHTNode> >::iterator itr =
       std::find_if(nodes_.begin(), nodes_.end(), derefEqual(node));
     if(itr != nodes_.end()) {

src/HttpRequest.cc

@@ -219,7 +219,7 @@ std::string HttpRequest::createRequest()
     val += base64::encode(authText.begin(), authText.end());
     builtinHds.push_back(std::make_pair("Authorization:", val));
   }
-  if(getPreviousURI().size()) {
+  if(!getPreviousURI().empty()) {
     builtinHds.push_back(std::make_pair("Referer:", getPreviousURI()));
   }
   if(cookieStorage_) {