BepInEx/BepInEx.IL2CPP/MonoExtensions.cs

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace BepInEx
{
    /// <summary>
    ///     Contains unofficial extensions to the underlying Mono runtime.
    /// </summary>
    public static class MonoExtensions
    {
        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern IntPtr GetFunctionPointerForDelegateInternal2(Delegate d, CallingConvention conv);

        public static IntPtr GetFunctionPointerForDelegate(Delegate d, CallingConvention conv)
        {
            if (d == null) throw new ArgumentNullException(nameof(d));

            return GetFunctionPointerForDelegateInternal2(d, conv);
        }
    }
}