GrowthRate wrappers.

PkmnLibSharp/Library/GrowthRates/ExternGrowthRate.cs

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+using System;
+using System.Runtime.InteropServices;
+
+namespace PkmnLibSharp.Library.GrowthRates
+{
+    public class ExternGrowthRate : GrowthRate
+    {
+        public delegate uint CalculateExperienceDelegate(byte level);
+
+        public delegate byte CalculateLevelDelegate(uint experience);
+
+        private ExternGrowthRate(IntPtr ptr) : base(ptr)
+        {
+        }
+
+        public static ExternGrowthRate Create(CalculateLevelDelegate levelFunc,
+            CalculateExperienceDelegate experienceFunc)
+        {
+            var ptr = IntPtr.Zero;
+            Creatureliblibrary.Generated.ExternGrowthRate.Construct(ref ptr,
+                Marshal.GetFunctionPointerForDelegate(levelFunc),
+                Marshal.GetFunctionPointerForDelegate(experienceFunc)
+            );
+            return new ExternGrowthRate(ptr);
+        }
+
+        protected override void DeletePtr()
+        {
+            Creatureliblibrary.Generated.ExternGrowthRate.Destruct(Ptr);
+        }
+    }
+}

PkmnLibSharp/Library/GrowthRates/GrowthRate.cs

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+using System;
+using PkmnLibSharp.Utilities;
+
+namespace PkmnLibSharp.Library.GrowthRates
+{
+    public abstract class GrowthRate : PointerWrapper
+    {
+        internal GrowthRate(IntPtr ptr) : base(ptr)
+        {
+        }
+
+        public byte CalculateLevel(uint experience)
+        {
+            byte b = 0;
+            Creatureliblibrary.Generated.GrowthRate.CalculateLevel(ref b, Ptr, experience).Assert();
+            return b;
+        }
+        
+        public uint CalculateExperience(byte level)
+        {
+            uint i = 0;
+            Creatureliblibrary.Generated.GrowthRate.CalculateExperience(ref i, Ptr, level).Assert();
+            return i;
+        }
+    }
+}

PkmnLibSharp/Library/GrowthRates/LookupGrowthRate.cs

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+using PkmnLibSharp.Utilities;
+
+namespace PkmnLibSharp.Library.GrowthRates
+{
+    public class LookupGrowthRate : GrowthRate
+    {
+        public LookupGrowthRate(uint[] experiencePerLevel) : base(
+            Creatureliblibrary.Generated.LookupGrowthRate.Construct(experiencePerLevel.ArrayPtr(),
+                (ulong) experiencePerLevel.Length))
+        {
+        }
+
+        protected override void DeletePtr()
+        {
+            Creatureliblibrary.Generated.LookupGrowthRate.Destruct(Ptr);
+        }
+    }
+}