Bartosz Milewski seems to like D more than C++ now :)
QAston
qaston at gmail.com
Fri Sep 20 00:39:45 PDT 2013
On Thursday, 19 September 2013 at 22:46:09 UTC, Andrei
Alexandrescu wrote:
> On 9/19/13 3:18 PM, Szymon Gatner wrote:
>> I had similar thoughts when watching GoingNaive 2013:
>> http://bartoszmilewski.com/2013/09/19/edward-chands/
>
> Nice piece.
>
>> I was more and more scared with every talk and now I am
>> valualizing my
>> polymorphic types a'la Sean Parent
>
> That I think is sketchy advice.
>
>
> Andrei
What Sean Parent does in his value semantics talk is basically an
interface adapter for a struct, wrapped in a struct providing
implicit conversions.
By using structs by default and adapting them to interfaces as
needed you get to have the smallest possible overhead on a single
function call - either no virtual dispatch or 1 virtual dispatch.
When writing adapters to interfaces you get 2 or more.
The other benefit is that approach is reducing dependencies you
need to know about when you use the wrapper type - the approach
would not work in D due to lack of argument dependent lookup so
you need to write the adapter type (for a particular type you
want to convert) yourself anyways. And I think it's better that
way.
In the end the whole thing is just adapter design pattern applied
to C++.
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