Congratulations to the D Team!

Timon Gehr timon.gehr at gmx.ch
Wed Jul 11 11:20:13 PDT 2012


On 07/11/2012 08:17 PM, Andrei Alexandrescu wrote:
> On 7/11/12 2:03 PM, Timon Gehr wrote:
>> I think they should be pure as much as I think they should be const.
>>
>> The reasoning is analogous for both.
>>
>> We have immutable class instances that want to provide the methods =>
>> make them const.
>>
>> We have pure functions that want to provide the methods => make them
>> pure.
>>

oops. I meant to write "We have pure functions that want to use the 
methods."

>> This reasoning is not taking into account the whole picture because
>>
>> We have implementations of those methods that want to use non-const
>> methods in their implementation. (eg. database connection)
>>
>> We have implementation of those methods that want to use non-pure
>> methods in their implementation (eg. database connection, logging)
>
> The essential difference is there's no "pure" object, so there's no
> motivation to plant "pure" on its methods.
>
> Andrei


auto foo(Object o)pure{
     // o is a "pure" object here
}


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