[Development] Deleter that calls deleteLater() for use with std::unique_ptr<> and other smart pointers

[Ville Voutilainen]

On 19 April 2017 at 20:48, Konstantin Tokarev <annulen at yandex.ru> wrote:
>
>
> 19.04.2017, 20:43, "Thiago Macieira" <thiago.macieira at intel.com>:
>> On quarta-feira, 19 de abril de 2017 06:44:24 PDT Konstantin Tokarev wrote:
>>>  Hello,
>>>
>>>  I think it will be a good idea to provide implementation of functor calling
>>>  deleteLater() instead of delete which can be used with std::unique_ptr,
>>>  std::shared_ptr and other smart pointers with compatible interface.
>>>
>>>  We already have QScopedPointerObjectDeleteLater, however it implements
>>>  cleanup(T*) instead of operator()(T*).
>>>
>>>  Any suggestions how to name this new class and where to place it?
>>
>> QSharedPointer already supports a PMF as a deleter.
>>
>>         auto ptr = QSharedPointer<QObject *>(new QObject, &QObject::deleteLater);
>>
>> So I think this actually belongs in the std-proposals mailing list, not in Qt.
>>
>> Until C++20 gets it, you can use a lambda.
>
> It's not possible to have members with auto-deduced types in non-template class,
> so I actually cannot.


I fail to see what auto-deduced members have to do with it:

std::unique_ptr<QObject, void(*)(QObject*)> upqobj{nullptr,
[](QObject* obj) { obj->deleteLater(); }};