/// <summary>
/// not指令，求某个变量是否为nil，a指定结果寄存器索引，b指定变量寄存器索引
/// </summary>
/// <param name="i"></param>
public void Not(Instruction i)
{
int a = 0, b = 0, c = 0;
i.ABC(ref a, ref b, ref c);
luaState.Push(new LuaValue(luaState.IsBool(b + 1), LuaValueType.Bool));
luaState.Replace(a + 1);
}
