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Re: About Nuller and Null [message #55103 is a reply to message #55102]

Sun, 11 October 2020 11:22

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Tom1 wrote on Sun, 11 October 2020 10:34

Please note that this can return real references, if T is a reference.

Well, Null is about "value null", or "empty value". Definitely was not meant to be used with NULL references or pointers...

If you insist on returning a reference to something and you want to use Null value as error, you can always do something like

const Foo& GetData(...)
{
    static Foo null_data = Null;
...
    if(error) return null_data;
...
}

I mean, instead of inventing something to contain NULL reference, just return a reference to Null value...

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[Message index]

		About Nuller and Null By: Tom1 on Sat, 10 October 2020 10:58
		Re: About Nuller and Null By: mirek on Sat, 10 October 2020 19:32
		Re: About Nuller and Null By: Tom1 on Sat, 10 October 2020 20:25
		Re: About Nuller and Null By: Tom1 on Sun, 11 October 2020 00:02
		Re: About Nuller and Null By: mirek on Sun, 11 October 2020 01:39
		Re: About Nuller and Null By: Tom1 on Sun, 11 October 2020 10:34
		Re: About Nuller and Null By: mirek on Sun, 11 October 2020 11:22
		Re: About Nuller and Null By: Tom1 on Sun, 11 October 2020 12:34

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