Use std::queue instead of list for ChangeRequestQueueProcessor (sd)

Change-Id: I2520efb92e4aef399b684262e0b7daa72d212598
Reviewed-on: https://gerrit.libreoffice.org/72073
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

sd/source/ui/framework/configuration/ChangeRequestQueue.hxx

@@ -22,7 +22,7 @@
 
 #include <com/sun/star/uno/Reference.hxx>
 
-#include <list>
+#include <queue>
 
 namespace com { namespace sun { namespace star { namespace drawing { namespace framework { class XConfigurationChangeRequest; } } } } }
 
@@ -33,7 +33,7 @@ namespace sd { namespace framework {
     ChangeRequestQueueProcessor to process these requests.
 */
 class ChangeRequestQueue
-    : public ::std::list<css::uno::Reference< css::drawing::framework::XConfigurationChangeRequest> >
+    : public ::std::queue<css::uno::Reference< css::drawing::framework::XConfigurationChangeRequest> >
 {
 public:
     /** Create an empty queue.

sd/source/ui/framework/configuration/ChangeRequestQueueProcessor.cxx

@@ -91,7 +91,7 @@ void ChangeRequestQueueProcessor::AddRequest (
     TraceRequest(rxRequest);
 #endif
 
-    maQueue.push_back(rxRequest);
+    maQueue.push(rxRequest);
     StartProcessing();
 }
 
@@ -135,7 +135,7 @@ void ChangeRequestQueueProcessor::ProcessOneEvent()
 
     // Get and remove the first entry from the queue.
     Reference<XConfigurationChangeRequest> xRequest (maQueue.front());
-    maQueue.pop_front();
+    maQueue.pop();
 
     // Execute the change request.
     if (xRequest.is())
@@ -176,7 +176,8 @@ void ChangeRequestQueueProcessor::ProcessUntilEmpty()
 void ChangeRequestQueueProcessor::Clear()
 {
     ::osl::MutexGuard aGuard (maMutex);
-    maQueue.clear();
+    ChangeRequestQueue aEmpty;
+    maQueue.swap(aEmpty);
 }
 
 } } // end of namespace sd::framework::configuration