Core/Utils: Replace boost flat_set with our own

(cherry picked from commit 42fbcf2fc58690346ef1db12803b79634985d44f)

3 files changed, 170 insertions, 5 deletions

diff --git a/src/common/Containers/FlatSet.h b/src/common/Containers/FlatSet.h
new file mode 100644
index 00000000000..5602ba17254
--- /dev/null
+++ b/src/common/Containers/FlatSet.h
@@ -0,0 +1,105 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * 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 TRINITYCORE_FLAT_SET_H
+#define TRINITYCORE_FLAT_SET_H
+
+#include <functional>
+#include <vector>
+
+namespace Trinity::Containers
+{
+template <class Key, class Compare = std::less<Key>, class KeyContainer = std::vector<Key>>
+class FlatSet
+{
+public:
+    using iterator = typename KeyContainer::iterator;
+    using const_iterator = typename KeyContainer::const_iterator;
+
+    bool empty() const { return _storage.empty(); }
+    auto size() const { return _storage.size(); }
+
+    auto begin()  { return _storage.begin(); }
+    auto begin() const { return _storage.begin(); }
+
+    auto end()  { return _storage.end(); }
+    auto end() const { return _storage.end(); }
+
+    auto find(Key const& value) const
+    {
+        auto end = this->end();
+        auto itr = std::lower_bound(this->begin(), end, value, Compare());
+        if (itr != end && Compare()(value, *itr))
+            itr = end;
+
+        return itr;
+    }
+
+    auto find(Key const& value)
+    {
+        auto end = this->end();
+        auto itr = std::lower_bound(this->begin(), end, value, Compare());
+        if (itr != end && Compare()(value, *itr))
+            itr = end;
+
+        return itr;
+    }
+
+    template <class... Args>
+    std::pair<iterator, bool> emplace(Args&&... args)
+    {
+        Key newElement(std::forward<Args>(args)...);
+        auto end = this->end();
+        auto itr = std::lower_bound(this->begin(), end, newElement, Compare());
+        if (itr != end && !Compare()(newElement, *itr))
+            return { itr, false };
+
+        return { _storage.emplace(itr, std::move(newElement)), true };
+    }
+
+    std::pair<iterator, bool> insert(Key const& key) { return emplace(key); }
+
+    std::size_t erase(Key const& key)
+    {
+        auto itr = this->find(key);
+        if (itr == this->end())
+            return 0;
+
+        this->erase(itr);
+        return 1;
+    }
+    auto erase(const_iterator itr) { return _storage.erase(itr); }
+
+    void clear() { _storage.clear(); }
+
+    void shrink_to_fit() { _storage.shrink_to_fit(); }
+
+    friend bool operator==(FlatSet const& left, FlatSet const& right)
+    {
+        return left._storage == right._storage;
+    }
+
+    friend bool operator!=(FlatSet const& left, FlatSet const& right)
+    {
+        return !(left == right);
+    }
+
+private:
+    KeyContainer _storage;
+};
+}
+
+#endif // TRINITYCORE_FLAT_SET_H
diff --git a/src/server/game/Spells/SpellInfo.cpp b/src/server/game/Spells/SpellInfo.cpp
index dd3c8ede288..1cd54720d54 100644
--- a/src/server/game/Spells/SpellInfo.cpp
+++ b/src/server/game/Spells/SpellInfo.cpp
@@ -20,6 +20,7 @@
 #include "Corpse.h"
 #include "Creature.h"
 #include "DBCStores.h"
+#include "FlatSet.h"
 #include "Item.h"
 #include "ItemTemplate.h"
 #include "Log.h"
@@ -30,7 +31,6 @@
 #include "SpellAuraEffects.h"
 #include "SpellMgr.h"
 #include "Vehicle.h"
-#include <boost/container/flat_set.hpp>
 
 uint32 GetTargetFlagMask(SpellTargetObjectTypes objType)
 {
@@ -228,8 +228,8 @@ struct SpellEffectInfo::ImmunityInfo
     uint32 DispelImmune = 0;
     uint32 DamageSchoolMask = 0;
 
-    boost::container::flat_set<AuraType> AuraTypeImmune;
-    boost::container::flat_set<SpellEffects> SpellEffectImmune;
+    Trinity::Containers::FlatSet<AuraType> AuraTypeImmune;
+    Trinity::Containers::FlatSet<SpellEffects> SpellEffectImmune;
 };
 
 std::array<SpellImplicitTargetInfo::StaticData, TOTAL_SPELL_TARGETS> SpellImplicitTargetInfo::_data =
@@ -3004,7 +3004,7 @@ bool SpellInfo::CanSpellProvideImmunityAgainstAura(SpellInfo const* auraSpellInf
                 continue;
 
             auto spellImmuneItr = immuneInfo->SpellEffectImmune.find(auraSpellEffectInfo.Effect);
-            if (spellImmuneItr == immuneInfo->SpellEffectImmune.cend())
+            if (spellImmuneItr == immuneInfo->SpellEffectImmune.end())
             {
                 immuneToAllEffects = false;
                 break;
@@ -3025,7 +3025,7 @@ bool SpellInfo::CanSpellProvideImmunityAgainstAura(SpellInfo const* auraSpellInf
                 {
                     bool isImmuneToAuraEffectApply = false;
                     auto auraImmuneItr = immuneInfo->AuraTypeImmune.find(auraName);
-                    if (auraImmuneItr != immuneInfo->AuraTypeImmune.cend())
+                    if (auraImmuneItr != immuneInfo->AuraTypeImmune.end())
                         isImmuneToAuraEffectApply = true;
 
                     if (!isImmuneToAuraEffectApply && !auraSpellInfo->IsPositiveEffect(auraSpellEffectInfo.EffectIndex) && !auraSpellInfo->HasAttribute(SPELL_ATTR2_UNAFFECTED_BY_AURA_SCHOOL_IMMUNE))
diff --git a/tests/common/FlatSet.cpp b/tests/common/FlatSet.cpp
new file mode 100644
index 00000000000..a0c50a62a45
--- /dev/null
+++ b/tests/common/FlatSet.cpp
@@ -0,0 +1,60 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * 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/>.
+ */
+
+#include "tc_catch2.h"
+
+#include "FlatSet.h"
+
+TEST_CASE("Insertion", "[FlatSet]")
+{
+    Trinity::Containers::FlatSet<int> flat;
+
+    REQUIRE(flat.insert(5).second == true);
+    REQUIRE(flat.insert(3).second == true);
+    REQUIRE(flat.insert(9).second == true);
+    REQUIRE(flat.insert(7).second == true);
+
+    REQUIRE(flat.insert(5).second == false);
+    REQUIRE(flat.insert(3).second == false);
+    REQUIRE(flat.insert(9).second == false);
+    REQUIRE(flat.insert(7).second == false);
+
+    REQUIRE(flat.size() == 4);
+
+    auto itr = flat.begin();
+    REQUIRE(*itr == 3);
+    ++itr;
+    REQUIRE(*itr == 5);
+    ++itr;
+    REQUIRE(*itr == 7);
+    ++itr;
+    REQUIRE(*itr == 9);
+    ++itr;
+    REQUIRE(itr == flat.end());
+}
+
+TEST_CASE("Erase", "[FlatSet]")
+{
+    Trinity::Containers::FlatSet<int> flat;
+    flat.insert(3);
+    flat.insert(5);
+    flat.insert(7);
+    flat.insert(9);
+
+    REQUIRE(flat.erase(7) == 1);
+    REQUIRE(flat.size() == 3);
+}