Issue 5141 - Generalize Map class to allow non-strings as keys

compiled/IntMap.h

+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-present eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus 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 Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <cstddef>
+#include <climits>
+
+#include "Map.h"
+
+namespace Uint32Map_internal
+{
+  struct Uint32SetEntry
+  {
+  public:
+    typedef uint32_t key_type;
+    typedef size_t size_type;
+
+  private:
+    static const key_type KEY_INVALID = 0xFFFFFFFF;
+    static const key_type KEY_DELETED = 0xFFFFFFFE;
+
+  public:
+    key_type first;
+
+    Uint32SetEntry(key_type key = KEY_INVALID)
+        : first(key)
+    {
+    }
+
+    bool equals(key_type other) const
+    {
+      return first == other;
+    }
+
+    bool is_invalid() const
+    {
+      return first == KEY_INVALID;
+    }
+
+    bool is_deleted() const
+    {
+      return first == KEY_DELETED;
+    }
+
+    void erase()
+    {
+      first = KEY_INVALID;
+    }
+
+    static size_type hash(key_type key)
+    {
+      return key;
+    }
+  };
+
+  template<typename Value>
+  struct Uint32MapEntry : Uint32SetEntry
+  {
+    typedef Uint32SetEntry super;
+    typedef Value value_type;
+
+    Value second;
+
+    Uint32MapEntry(key_type key = key_type(), value_type value = value_type())
+        : Uint32SetEntry(key), second(value)
+    {
+    }
+
+    void erase()
+    {
+      super::erase();
+      second = value_type();
+    }
+  };
+}
+
+using Uint32Set = Set<Uint32Map_internal::Uint32SetEntry>;
+
+template<typename Value>
+using Uint32Map = Map<Uint32Map_internal::Uint32MapEntry<Value>>;