Core/Shared: Move container functions to shared project under Trinity::Container namespace. Also implement RandomResizeList which takes a predicate function as parameter.

Core/ScriptedAI: Extend SummonList::DoAction to take a predicate function as parameter and allow specifying a maximum number of units to be selected.

1 files changed, 66 insertions, 0 deletions

diff --git a/src/server/shared/Containers.h b/src/server/shared/Containers.h
new file mode 100644
index 00000000000..dff23da763a
--- /dev/null
+++ b/src/server/shared/Containers.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2008-2012 TrinityCore <http://www.trinitycore.org/>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TRINITY_CONTAINERS_H
+#define TRINITY_CONTAINERS_H
+
+namespace Trinity
+{
+    namespace Containers
+    {
+        template<class T>
+        void RandomResizeList(std::list<T> &list, uint32 size)
+        {
+            size_t list_size = list.size();
+
+            while (list_size > size)
+            {
+                typename std::list<T>::iterator itr = list.begin();
+                std::advance(itr, urand(0, list_size - 1));
+                list.erase(itr);
+                --list_size;
+            }
+        }
+
+        template<class T, class Predicate>
+        void RandomResizeList(std::list<T> &list, Predicate& predicate, uint32 size)
+        {
+            //! First use predicate filter
+            std::list<T> listCopy;
+            for (typename std::list<T>::iterator itr = list.begin(); itr != list.end(); ++itr)
+                if (predicate(*itr))
+                    listCopy.push_back(*itr);
+
+            if (size)
+                RandomResizeList(listCopy, size);
+
+            list = listCopy;
+        }
+
+        /* Select a random element from a container. Note: make sure you explicitly empty check the container */
+        template <class C> typename C::value_type const& SelectRandomContainerElement(C const& container)
+        {
+            typename C::const_iterator it = container.begin();
+            std::advance(it, urand(0, container.size() - 1));
+            return *it;
+        }
+    };
+    //! namespace Containers
+};
+//! namespace Trinity
+
+#endif //! #ifdef TRINITY_CONTAINERS_H
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