Re: [boost] [optional] from_optional

From: Aristid Breitkreuz (aribrei_at_[hidden])
Date: 2006-03-26 12:49:18

Am Sonntag, den 12.03.2006, 11:38 +0100 schrieb Václav Veselý:
> Hi,
> 
> There is a common need of getting a value from an optional with possibility
> to
> define a default value in case of the optional is uninitialized. I suggest
> two
> alternatives:

I recently had this need too. Modern C++ also means clean and
nice-looking code, IMHO. So we need this! I am really posting only to
this relatively old thread because I find the need real and stumbled
upon it very recently.

> 
>     optional<int> o;
>     int i = o.get(123); // a meber function get with an additional parameter
>     int j = from_optional(o, 123); // a free function
> 
> Both alternatives can be implemented simultaneously.
> 
> What do you think about it?

I'd prefer a member function because I also don't like free functions
like "get". I'd rather write x.template foo. A nice method name would be
get_with_default. The alternative get_or_default is hardly readable.
Just with_default would be fine for me, too.

> 
> Regards,
> Vaclav

Aristid
> 
> 
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