Hi,

With namespace I have a problem with casts - they become much longer and
unpredictable.
MyEnum value = MyEnum::A; //compilation error.
and because I'm casting much more than calling specific functions, this
solution will not work for me.

It is the reason why I need a function inside an enum.

Kind regards,
Dmitrii Shabalin.

ср, 12 мар. 2025 г. в 15:23, Jeremy Rifkin via Std-Proposals <
std-proposals_at_[hidden]>:

> Hi,
> If all you want is a free function that looks like it is scoped in the
> enum, do this:
>
> namespace MyEnum {
>
> enum Constant { A, B, C };
>
> void my_function(Constant);
>
> }
>
> I don’t think you gain much from this sort of thing though.
>
> Cheers,
> Jeremy
>
> On Tue, Mar 11, 2025 at 20:34 Dmitrii Shabalin via Std-Proposals <
> std-proposals_at_[hidden]> wrote:
>
>> Hi Andre.
>> No, enum still an int.
>> However, inside in the enum scope - enum class has a scope - it would
>> have a static function.
>>
>> Kind regards,
>> Dmitrii Shabalin.
>>
>> ср, 12 мар. 2025 г. в 12:30, Andre Kostur <andre_at_[hidden]>:
>>
>>> This seems to be ignoring that the underlying storage for the enum is
>>> an int (of varying sizes). Now there needs to be an int, and
>>> additional space for each lambda object that one might add. I'm not
>>> seeing the immediate benefit over a normal free function.
>>>
>>> On Tue, Mar 11, 2025 at 4:20 PM Dmitrii Shabalin via Std-Proposals
>>> <std-proposals_at_[hidden]> wrote:
>>> >
>>> > Hi.
>>> > Since C++11 we have lambdas.
>>> > I believe, everyone, who works with enums, write some functions for
>>> this particular enum only.
>>> > However, there is no way to associate this function with the enum's
>>> namespace.
>>> > My idea: we can set a value for any of enum fields. It should be const
>>> and could be constexpr.
>>> > May be, we can set a lambda for a field too?
>>> > something like:
>>> > enum Test{
>>> > testValue = 0,
>>> > toString =[](Test value) -> std::string { if (value == testValue)
>>> return "testValue"; else return ""; },
>>> > max = testValue
>>> > }
>>> >
>>> > And usage will be something like:
>>> > std::cout << "Test value" << Test::toString(Test::testValue);
>>> > --
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>>> > Std-Proposals_at_[hidden]
>>> > https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals
>>>
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