Old problem with performance

[Denis Koroskin]

On Sun, 08 Feb 2009 17:07:31 +0300, Weed <resume755 at mail.ru> wrote:

> Denis Koroskin пишет:
>
>> Your C objects have value semantics. For value semantics you should use  
>> value types.
>
> At present in D is not contain support of value types for objects.
> (I consider that it is necessary)
>
>> Alternatively you may want to use the following trick (I used it for  
>> lazy string concatenation in C+):
>
> [skip]
>
>> Apparently, it doesn't work at the moment because ctor can't be a
>> template :(
>> Is there an enhancement request in bugzilla? It prevents this pattern
>> from working.
>
> + it is difficult and also it will be even more difficult if it will be
> necessary to make support for the construction like:
>
> space_ship_1.calculatePathTo("Moon").getCheckpoint(3).getCoords;
>
> In this example we create a temporary class "path", create temporary
> class "checkpoint" and we take coords of checkpoint of this path. It is
> not expedient to us to store all this path and checkpoint because it is
> vary.
>
> (from
> http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D&article_id=81432)

I believe you should stick with structs for that.