Core/Utils: Moved rng functions to separate header and added utility functions to select a random element from a container where each element can have different chance of being selected

(cherry picked from commit ae20b2ab56)
(cherry picked from commit 921d893c2a)
(cherry picked from commit 9ab10d6e68)
(cherry picked from commit 00c878e73a)
(cherry picked from commit ff9c999334)
(cherry picked from commit bc94bacce4)
(cherry picked from commit d5b0ffbe9b)

src/server/shared/Containers.h

@@ -1,114 +0,0 @@
-/*
- * Copyright (C) 2008-2016 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
-
-#include "Define.h"
-#include <list>
-
-//! Because circular includes are bad
-extern uint32 urand(uint32 min, uint32 max);
-
-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;
-        }
-
-        /**
-        * @fn bool Trinity::Containers::Intersects(Iterator first1, Iterator last1, Iterator first2, Iterator last2)
-        *
-        * @brief Checks if two SORTED containers have a common element
-        *
-        * @param first1 Iterator pointing to start of the first container
-        * @param last1 Iterator pointing to end of the first container
-        * @param first2 Iterator pointing to start of the second container
-        * @param last2 Iterator pointing to end of the second container
-        *
-        * @return true if containers have a common element, false otherwise.
-        */
-        template<class Iterator1, class Iterator2>
-        bool Intersects(Iterator1 first1, Iterator1 last1, Iterator2 first2, Iterator2 last2)
-        {
-            while (first1 != last1 && first2 != last2)
-            {
-                if (*first1 < *first2)
-                    ++first1;
-                else if (*first2 < *first1)
-                    ++first2;
-                else
-                    return true;
-            }
-
-            return false;
-        }
-
-        template<class K, class V, template<class, class, class...> class M, class... Rest>
-        void MultimapErasePair(M<K, V, Rest...>& multimap, K const& key, V const& value)
-        {
-            auto range = multimap.equal_range(key);
-            for (auto itr = range.first; itr != range.second;)
-            {
-                if (itr->second == value)
-                    itr = multimap.erase(itr);
-                else
-                    ++itr;
-            }
-        }
-
-    }
-    //! namespace Containers
-}
-//! namespace Trinity
-
-#endif //! #ifdef TRINITY_CONTAINERS_H