Refactoring LookupContext.h

Extracting class AlreadyConsideredClassContainer to separate file

Change-Id: If3bb89df5ce0bae87723ad4ecab7118337df0655
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/libs/cplusplus/LookupContext.h

@@ -32,6 +32,7 @@
 
 #include "CppDocument.h"
 #include "LookupItem.h"
+#include "AlreadyConsideredClassContainer.h"
 #include <FullySpecifiedType.h>
 #include <Type.h>
 #include <SymbolVisitor.h>
@@ -44,41 +45,6 @@
 namespace CPlusPlus {
 
 class CreateBindings;
-class Class;
-template<typename T>
-class AlreadyConsideredClassContainer
-{
-public:
-    AlreadyConsideredClassContainer() : _class(0) {}
-    void insert(const T *item)
-    {
-        if (_container.isEmpty())
-            _class = item;
-        _container.insert(item);
-    }
-    bool contains(const T *item)
-    {
-        if (_container.contains(item))
-            return true;
-
-        foreach (const T *existingItem, _container) {
-            if (existingItem->isEqualTo(item))
-                return true;
-        }
-
-        return false;
-    }
-
-    void clear(const T *item)
-    {
-        if (_class != item || _container.size() == 1)
-            _container.clear();
-    }
-
-private:
-    QSet<const T *> _container;
-    const T * _class;
-};
 
 class CPLUSPLUS_EXPORT ClassOrNamespace
 {