Core/Misc: Util changes

* Move IteratorPair to its own header
* Add AsUnderlyingType function to cast enum value to its underlying type (avoids repeating std::underlying_type everywhere)

1 files changed, 57 insertions, 0 deletions

diff --git a/src/common/Utilities/IteratorPair.h b/src/common/Utilities/IteratorPair.h
new file mode 100644
index 00000000000..894e1637a71
--- /dev/null
+++ b/src/common/Utilities/IteratorPair.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2008-2017 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 IteratorPair_h__
+#define IteratorPair_h__
+
+#include "Define.h"
+#include <utility>
+
+namespace Trinity
+{
+    /**
+     * @class IteratorPair
+     *
+     * @brief Utility class to enable range for loop syntax for multimap.equal_range uses
+     */
+    template<class iterator>
+    class IteratorPair
+    {
+    public:
+        IteratorPair() : _iterators() { }
+        IteratorPair(std::pair<iterator, iterator> iterators) : _iterators(iterators) { }
+
+        iterator begin() const { return _iterators.first; }
+        iterator end() const { return _iterators.second; }
+
+    private:
+        std::pair<iterator, iterator> _iterators;
+    };
+
+    namespace Containers
+    {
+        template<class M>
+        inline auto MapEqualRange(M& map, typename M::key_type const& key) -> IteratorPair<decltype(map.begin())>
+        {
+            return { map.equal_range(key) };
+        }
+    }
+    //! namespace Containers
+}
+//! namespace Trinity
+
+#endif // IteratorPair_h__