Adds ScopedOwner class, that disposes owned values when garbage collected.

PkmnLibSharp/Battling/Battle/Battle.cs

@@ -236,7 +236,10 @@ namespace PkmnLibSharp.Battling
 
         public override void Dispose()
         {
-            Creaturelib.Generated.Battle.ClearBattle(Ptr);
+            if (!IsDeleted)
+            {
+                Creaturelib.Generated.Battle.ClearBattle(Ptr);
+            }
             base.Dispose();
         }
     }

PkmnLibSharp/Battling/Battle/BattleBuilder.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using PkmnLibSharp.Utilities;
 
 namespace PkmnLibSharp.Battling
 {
@@ -34,11 +35,12 @@ namespace PkmnLibSharp.Battling
             return this;
         }
 
-        public virtual Battle Build()
+        public virtual ScopedOwner<Battle> Build()
         {
             // Use the milliseconds since epoch time as random seed if none is specified.
             _seed ??= (ulong) (DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalMilliseconds;
-            return new Battle(_library, _parties.ToArray(), _canFlee, _numberOfSides, _pokemonPerSide, _seed.Value);
+            return new ScopedOwner<Battle>(new Battle(_library, _parties.ToArray(), _canFlee, _numberOfSides,
+                _pokemonPerSide, _seed.Value));
         }
     }
 }

PkmnLibSharp/Battling/Battle/ExecutingMove.cs

@@ -67,6 +67,12 @@ namespace PkmnLibSharp.Battling
         private LearnedMove? _move;
         private Pokemon? _user;
         private ReadOnlyNativePtrArray<Pokemon>? _targets;
+
+        public override string ToString()
+        {
+            return base.ToString() + $": {Move.Move.Name}";
+        }
+
         protected override void DeletePtr()
         {
         }

PkmnLibSharp/Battling/LearnedMove.cs

@@ -41,7 +41,12 @@ namespace PkmnLibSharp.Battling
             (MoveLearnMethod) Creaturelib.Generated.LearnedAttack.GetLearnMethod(Ptr);
 
         private MoveData? _move;
-        
+
+        public override string ToString()
+        {
+            return base.ToString() + $": {Move.Name} PP: {RemainingUses}/{MaxUses}";
+        }
+
         protected override void DeletePtr()
         {
             LearnedAttack.Destruct(Ptr);

PkmnLibSharp/Battling/Pokemon.cs

@@ -487,7 +487,12 @@ namespace PkmnLibSharp.Battling
         private Nature? _nature;
         private Battle? _battle;
         private BattleSide? _battleSide;
-        
+
+        public override string ToString()
+        {
+            return base.ToString() + $": {Species.Name}-{Forme.Name} lv. {Level} HP: {CurrentHealth}/{MaxHealth}";
+        }
+
         protected override void DeletePtr()
         {
             Pkmnlib.Generated.Pokemon.Destruct(Ptr);

PkmnLibSharp/Battling/PokemonBuilder.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using PkmnLibSharp.Library;
 using PkmnLibSharp.Library.Items;
 using PkmnLibSharp.Library.Moves;
+using PkmnLibSharp.Utilities;
 using Random = PkmnLibSharp.Utilities.Random;
 
 namespace PkmnLibSharp.Battling
@@ -150,7 +151,7 @@ namespace PkmnLibSharp.Battling
 
         protected abstract TLearnedMove CreateLearnedMove(MoveData move, byte maxUses, MoveLearnMethod learnMethod);
 
-        public TPokemon Build(Random? random = null)
+        public ScopedOwner<TPokemon> Build(Random? random = null)
         {
             if (!Library.StaticLibrary.SpeciesLibrary.TryGet(Species, out var species))
             {
@@ -200,7 +201,7 @@ namespace PkmnLibSharp.Battling
                 Gender = species.GetRandomGender(random);
             }
             
-            return Finalize(species, forme!, heldItem, moves, nature);
+            return new ScopedOwner<TPokemon>(Finalize(species, forme!, heldItem, moves, nature));
         }
     }
 }

PkmnLibSharp/Battling/PokemonParty.cs

@@ -106,10 +106,12 @@ namespace PkmnLibSharp.Battling
         protected internal override void MarkAsDeleted()
         {
             base.MarkAsDeleted();
-            foreach (var pokemon in Party)
+            for (var index = 0; index < Party.Count; index++)
             {
+                var pokemon = Party.GetDontInitialise(index);
                 pokemon?.MarkAsDeleted();
             }
+
             _cache = null;
         }
 

PkmnLibSharp/Library/Items/Item.cs

@@ -32,6 +32,11 @@ namespace PkmnLibSharp.Library.Items
             Initialize(p);
         }
 
+        public override string ToString()
+        {
+            return base.ToString() + $": {Name}";
+        }
+
         protected override void DeletePtr()
         {
             Pkmnlib.Generated.Item.Destruct(Ptr);

PkmnLibSharp/Library/Moves/MoveData.cs

@@ -44,6 +44,11 @@ namespace PkmnLibSharp.Library.Moves
             Initialize(ptr);
         }
 
+        public override string ToString()
+        {
+            return base.ToString() + $": {Name}";
+        }
+
         protected override void DeletePtr()
         {
             AttackData.Destruct(Ptr);

PkmnLibSharp/Library/Species/Forme.cs

@@ -143,6 +143,11 @@ namespace PkmnLibSharp.Library
             return SpeciesVariant.HasFlag(Ptr, flag.ToPtr()) == 1;
         }
 
+        public override string ToString()
+        {
+            return base.ToString() + $": {Name}";
+        }
+
         protected internal override void MarkAsDeleted()
         {
             base.MarkAsDeleted();

PkmnLibSharp/Library/Species/Species.cs

@@ -146,6 +146,11 @@ namespace PkmnLibSharp.Library
         private ReadOnlyNativePtrArray<Forme>? _formes;
         private string[]? _eggGroups;
 
+        public override string ToString()
+        {
+            return $"(#{Ptr}) -> Species: {Name}";
+        }
+
         protected internal override void MarkAsDeleted()
         {
             base.MarkAsDeleted();

PkmnLibSharp/Utilities/PointerWrapper.cs

@@ -11,7 +11,7 @@ namespace PkmnLibSharp.Utilities
         {
             get
             {
-                if (_isDeleted)
+                if (IsDeleted)
                 {
                     throw new Exception(
                         "Pointer access after dispose detected. This is not legal, and will cause native exceptions.");
@@ -21,7 +21,7 @@ namespace PkmnLibSharp.Utilities
             }
         }
 
-        private bool _isDeleted = false;
+        protected bool IsDeleted { get; private set; } = false;
 
         private static readonly ConcurrentDictionary<IntPtr, WeakReference<PointerWrapper>> Cached =
             new ConcurrentDictionary<IntPtr, WeakReference<PointerWrapper>>();
@@ -48,7 +48,7 @@ namespace PkmnLibSharp.Utilities
         
         ~PointerWrapper()
         {
-            if (!_isDeleted)
+            if (!IsDeleted)
                 Cached.TryRemove(Ptr, out _);
         }
 
@@ -80,7 +80,7 @@ namespace PkmnLibSharp.Utilities
 
         public virtual void Dispose()
         {
-            if (_isDeleted)
+            if (IsDeleted)
                 return;
             DeletePtr();
             MarkAsDeleted();
@@ -88,7 +88,7 @@ namespace PkmnLibSharp.Utilities
 
         protected internal virtual void MarkAsDeleted()
         {
-            _isDeleted = true;
+            IsDeleted = true;
             Cached.TryRemove(_ptr, out _);
         }
 

PkmnLibSharp/Utilities/ReadOnlyNativePtrArray.cs

@@ -70,6 +70,25 @@ namespace PkmnLibSharp.Utilities
             }
             return -1;
         }
+
+        internal T? GetDontInitialise(int index)
+        {
+            unsafe
+            {
+                if (index >= Count)
+                    throw new IndexOutOfRangeException();
+                // Where's your god now?
+                // (We add the offset of the index to the pointer, then dereference the pointer pointer to get the actual pointer to the object we want.)
+                var p = new IntPtr(*(void**)IntPtr.Add(_ptr, index * IntPtr.Size).ToPointer());
+                if (p == IntPtr.Zero)
+                    return null;
+                if (_cache[index]?.Ptr == p)
+                    return _cache[index]!;
+                if (PointerWrapper.TryResolvePointer(p, out T? t)) 
+                    return t!;
+                return null;
+            }
+        }
         
         public T? this[int index]
         {

PkmnLibSharp/Utilities/ScopedOwner.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+
+namespace PkmnLibSharp.Utilities
+{
+    /// <summary>
+    /// Helper class to ensure an object is disposed when it goes out of scope.
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class ScopedOwner<T> : IDisposable where T : PointerWrapper
+    {
+        public T? Value { get; private set; }
+        
+        public ScopedOwner(T value)
+        {
+            Value = value;
+        }
+
+        public T? TakeOwnership()
+        {
+            var val = Value;
+            Value = null;
+            return val;
+        }
+
+        ~ScopedOwner()
+        {
+            if (Value != null)
+                Value.Dispose();
+        }
+
+        public static implicit operator T?(ScopedOwner<T> val) => val.Value;
+
+        public override string ToString()
+        {
+            if (Value == null) return "null";
+            return Value.ToString();
+        }
+
+        public void Dispose()
+        {
+            if (Value != null)
+                Value.Dispose();
+            Value = null;
+        }
+
+        protected bool Equals(ScopedOwner<T> other)
+        {
+            return EqualityComparer<T?>.Default.Equals(Value, other.Value);
+        }
+
+        public override bool Equals(object? obj)
+        {
+            if (ReferenceEquals(null, obj)) return false;
+            if (ReferenceEquals(this, obj)) return true;
+            if (obj.GetType() != this.GetType()) return false;
+            return Equals((ScopedOwner<T>) obj);
+        }
+
+        public override int GetHashCode()
+        {
+            return EqualityComparer<T?>.Default.GetHashCode(Value);
+        }
+
+        public static bool operator ==(ScopedOwner<T>? left, ScopedOwner<T>? right)
+        {
+            return Equals(left, right);
+        }
+
+        public static bool operator !=(ScopedOwner<T>? left, ScopedOwner<T>? right)
+        {
+            return !Equals(left, right);
+        }
+    }
+}

PkmnLibSharpTests/Battling/BattleTests/BasicBattleTests.cs

@@ -16,12 +16,12 @@ namespace PkmnLibSharpTests.Battling.BattleTests
         {
             var lib = BattleLibraryHelper.GetLibrary();
             var battle = new BattleBuilder(lib, true, 2, 1).Build();
-            Assert.AreEqual(lib, battle.Library);
-            Assert.AreEqual(true, battle.CanFlee);
-            Assert.AreEqual(2, battle.SidesCount);
-            Assert.AreEqual(false, battle.HasEnded);
-            Assert.AreEqual(0, battle.PartiesCount);
-            battle.Dispose();
+            Assert.AreEqual(lib, battle.Value.Library);
+            Assert.AreEqual(true, battle.Value.CanFlee);
+            Assert.AreEqual(2, battle.Value.SidesCount);
+            Assert.AreEqual(false, battle.Value.HasEnded);
+            Assert.AreEqual(0, battle.Value.PartiesCount);
+            battle.Value.Dispose();
         }
 
         private static PokemonParty BuildTestParty(BattleLibrary lib)
@@ -45,10 +45,10 @@ namespace PkmnLibSharpTests.Battling.BattleTests
                     .WithPartyOnPositions(p1, new BattlePosition(0, 0))
                     .WithPartyOnPositions(p2, new BattlePosition(1, 0))
                     .Build();
-            Assert.AreEqual(2, battle.PartiesCount);
-            Assert.AreEqual(p1, battle.Parties[0].Party);
-            Assert.AreEqual(p2, battle.Parties[1].Party);
-            battle.Dispose();
+            Assert.AreEqual(2, battle.Value.PartiesCount);
+            Assert.AreEqual(p1, battle.Value.Parties[0].Party);
+            Assert.AreEqual(p2, battle.Value.Parties[1].Party);
+            battle.Value.Dispose();
         }
         
         [Test]
@@ -63,19 +63,19 @@ namespace PkmnLibSharpTests.Battling.BattleTests
                     .WithPartyOnPositions(p2, new BattlePosition(1, 0))
                     .Build();
             
-            battle.SwitchPokemon(0, 0, p1.GetAtIndex(0));
-            battle.SwitchPokemon(1, 0, p2.GetAtIndex(0));
-            Assert.AreEqual(0, battle.CurrentTurn);
+            battle.Value.SwitchPokemon(0, 0, p1.GetAtIndex(0));
+            battle.Value.SwitchPokemon(1, 0, p2.GetAtIndex(0));
+            Assert.AreEqual(0, battle.Value.CurrentTurn);
 
             var moveTurn1 = new MoveTurnChoice(p1.GetAtIndex(0), p1.GetAtIndex(0).Moves[0], 1, 0 );
             var moveTurn2 = new MoveTurnChoice(p2.GetAtIndex(0), p2.GetAtIndex(0).Moves[0], 0, 0 );
 
-            Assert.That(battle.TrySetChoice(moveTurn1));
-            Assert.That(battle.TrySetChoice(moveTurn2));
+            Assert.That(battle.Value.TrySetChoice(moveTurn1));
+            Assert.That(battle.Value.TrySetChoice(moveTurn2));
             
-            Assert.AreEqual(battle.CurrentTurn, 1);
+            Assert.AreEqual(battle.Value.CurrentTurn, 1);
             
-            battle.Dispose();
+            battle.Value.Dispose();
         }
         
         [Test]
@@ -97,18 +97,18 @@ namespace PkmnLibSharpTests.Battling.BattleTests
                 evts.Add(evt);
                 return Task.CompletedTask;
             });
-            battle.RegisterEventListener(eventListener);
+            battle.Value.RegisterEventListener(eventListener);
             
-            battle.SwitchPokemon(0, 0, p1.GetAtIndex(0));
-            battle.SwitchPokemon(1, 0, p2.GetAtIndex(0));
-            Assert.AreEqual(0, battle.CurrentTurn);
+            battle.Value.SwitchPokemon(0, 0, p1.GetAtIndex(0));
+            battle.Value.SwitchPokemon(1, 0, p2.GetAtIndex(0));
+            Assert.AreEqual(0, battle.Value.CurrentTurn);
 
             var moveTurn1 = new MoveTurnChoice(p1.GetAtIndex(0), p1.GetAtIndex(0).Moves[0], 1, 0 );
             var moveTurn2 = new MoveTurnChoice(p2.GetAtIndex(0), p2.GetAtIndex(0).Moves[0], 0, 0 );
 
-            Assert.That(battle.TrySetChoice(moveTurn1));
-            Assert.That(battle.TrySetChoice(moveTurn2));
-            Assert.AreEqual(1, battle.CurrentTurn);
+            Assert.That(battle.Value.TrySetChoice(moveTurn1));
+            Assert.That(battle.Value.TrySetChoice(moveTurn2));
+            Assert.AreEqual(1, battle.Value.CurrentTurn);
             
             eventListener.EnsureFinishedListening();
 
@@ -117,7 +117,7 @@ namespace PkmnLibSharpTests.Battling.BattleTests
             Assert.AreEqual(damageEvents[0].Pokemon, p2.GetAtIndex(0));
             Assert.AreEqual(damageEvents[1].Pokemon, p1.GetAtIndex(0));
             
-            battle.Dispose();
+            battle.Value.Dispose();
         }
         
         [Test]
@@ -140,21 +140,21 @@ namespace PkmnLibSharpTests.Battling.BattleTests
                 evts.Add(evt);
                 return Task.CompletedTask;
             });
-            battle.RegisterEventListener(eventListener);
+            battle.Value.RegisterEventListener(eventListener);
 
-            battle.SwitchPokemon(0, 0, p1.GetAtIndex(0));
-            battle.SwitchPokemon(1, 0, p2.GetAtIndex(0));
-            Assert.AreEqual(0, battle.CurrentTurn);
+            battle.Value.SwitchPokemon(0, 0, p1.GetAtIndex(0));
+            battle.Value.SwitchPokemon(1, 0, p2.GetAtIndex(0));
+            Assert.AreEqual(0, battle.Value.CurrentTurn);
 
             var moveTurn1 = new MoveTurnChoice(p1.GetAtIndex(0), p1.GetAtIndex(0).Moves[0], 1, 0 );
             var moveTurn2 = new MoveTurnChoice(p2.GetAtIndex(0), p2.GetAtIndex(0).Moves[0], 0, 0 );
 
-            Assert.That(battle.TrySetChoice(moveTurn1));
-            Assert.That(battle.TrySetChoice(moveTurn2));
+            Assert.That(battle.Value.TrySetChoice(moveTurn1));
+            Assert.That(battle.Value.TrySetChoice(moveTurn2));
             
-            Assert.AreEqual(battle.CurrentTurn, 1);
+            Assert.AreEqual(battle.Value.CurrentTurn, 1);
             
-            battle.Dispose();
+            battle.Value.Dispose();
             
             mon1.Heal(1000, true);
             mon2.Heal(1000, true);

PkmnLibSharpTests/Battling/PokemonBuilderTests.cs

@@ -13,9 +13,9 @@ namespace PkmnLibSharpTests.Battling
             var lib = BattleLibraryHelper.GetLibrary();
             var pokemon = new PokemonBuilder(lib, "testSpecies", 50)
                 .Build();
-            Assert.AreEqual("testSpecies", pokemon.Species.Name);
-            Assert.AreEqual(50, pokemon.Level);
-            Assert.AreEqual("default", pokemon.Forme.Name);
+            Assert.AreEqual("testSpecies", pokemon.Value.Species.Name);
+            Assert.AreEqual(50, pokemon.Value.Level);
+            Assert.AreEqual("default", pokemon.Value.Forme.Name);
             pokemon.Dispose();
         }
         
@@ -26,7 +26,7 @@ namespace PkmnLibSharpTests.Battling
             var pokemon = new PokemonBuilder(lib, "testSpecies", 50)
                 .WithNickname("cuteNickname")
                 .Build();
-            Assert.AreEqual("cuteNickname", pokemon.Nickname);
+            Assert.AreEqual("cuteNickname", pokemon.Value.Nickname);
             pokemon.Dispose();
         }
 
@@ -37,7 +37,7 @@ namespace PkmnLibSharpTests.Battling
             var pokemon = new PokemonBuilder(lib, "testSpecies", 50)
                 .WithGender(Gender.Female)
                 .Build();
-            Assert.AreEqual(Gender.Female, pokemon.Gender);
+            Assert.AreEqual(Gender.Female, pokemon.Value.Gender);
             pokemon.Dispose();
         }
 
@@ -49,8 +49,8 @@ namespace PkmnLibSharpTests.Battling
                 .LearnMove("testMove", MoveLearnMethod.Unknown)
                 .LearnMove("testMove2", MoveLearnMethod.Level)
                 .Build();
-            Assert.AreEqual("testMove", pokemon.Moves[0].Move.Name);
-            Assert.AreEqual("testMove2", pokemon.Moves[1].Move.Name);
+            Assert.AreEqual("testMove", pokemon.Value.Moves[0].Move.Name);
+            Assert.AreEqual("testMove2", pokemon.Value.Moves[1].Move.Name);
             pokemon.Dispose();
         }