PkmnLibRSharp/PkmnLibRSharp/FFI/NativeResult.cs

using System;
using System.Runtime.InteropServices;
using PkmnLibSharp.Utils;

namespace PkmnLibSharp.FFI
{
    internal struct NativeResult
    {
        private readonly IntPtr Error = IntPtr.Zero;
        
        internal NativeResult(IntPtr error)
        {
            Error = error;
        }
        
        public void Result()
        {
            if (Error != IntPtr.Zero)
            {
                throw new PkmnLibException(Error.PtrString()!);
            }
        }
    }

    internal struct NativeResult<T> where T : new()
    {
        private readonly IntPtr Error = IntPtr.Zero;
        private readonly T Data = new();
        
        internal NativeResult(IntPtr error, T data)
        {
            Error = error;
            Data = data;
        }
        
        public T Result()
        {
            if (Error != IntPtr.Zero)
            {
                throw new PkmnLibException(Error.PtrString()!);
            }
            return Data;
        }
    }

    public class PkmnLibException : Exception
    {
        internal PkmnLibException(string message) : base(message){}
    }
}