Ordne SystemBackends nach Priorit?ten

1 files changed, 14 insertions, 1 deletions

diff --git a/src/Common/SystemBackend.h b/src/Common/SystemBackend.h
index 960082e..c531224 100644
--- a/src/Common/SystemBackend.h
+++ b/src/Common/SystemBackend.h
@@ -48,7 +48,16 @@ class SystemBackend {
     };
 
   private:
-    static std::set<SystemBackend*> backends;
+    struct Compare {
+      bool operator() (const SystemBackend *b1, const SystemBackend *b2) {
+        if(b1->getPriority() == b2->getPriority())
+          return (b1 > b2);
+        else
+          return (b1->getPriority() > b2->getPriority());
+      }
+    };
+
+    static std::set<SystemBackend*, Compare> backends;
 
   protected:
     SystemBackend() {}
@@ -76,6 +85,10 @@ class SystemBackend {
       return ret;
     }
 
+    virtual int getPriority() const {
+      return 0;
+    }
+
   public:
     virtual ~SystemBackend() {}