private static unsafe void TestTypeEquivalenceWithTypePunning()
{
Console.WriteLine($"{nameof(TestTypeEquivalenceWithTypePunning)}");
{
Console.WriteLine($"-- GetFunctionPointer()");
IntPtr fptr = typeof(CreateFunctionPointer).GetMethod("For_1").MethodHandle.GetFunctionPointer();
Assert.NotEqual(IntPtr.Zero, fptr);
var s = new OnlyLoadOnce_1()
{
Field = 0x11
};
int res = ((delegate * < OnlyLoadOnce_1, int >)fptr)(s);
Assert.Equal(s.Field, res);
}
{
Console.WriteLine($"-- Ldftn");
IntPtr fptr = CreateFunctionPointer.For_2_Ldftn();
Assert.NotEqual(IntPtr.Zero, fptr);
var s = new OnlyLoadOnce_2()
{
Field = 0x22
};
int res = ((delegate * < OnlyLoadOnce_2, int >)fptr)(s);
Assert.Equal(s.Field, res);
}
{
Console.WriteLine($"-- Ldvirtftn");
IntPtr fptr = CreateFunctionPointer.For_3_Ldvirtftn(out object inst);
Assert.NotEqual(IntPtr.Zero, fptr);
var s = new OnlyLoadOnce_3()
{
Field = 0x33
};
int res = ((delegate * < object, OnlyLoadOnce_3, int >)fptr)(inst, s);
Assert.Equal(s.Field, res);
}
}
public static int GetField_1(OnlyLoadOnce_1 s)
{
return(s.Field);
}