Old problem with performance

[Christopher Wright]

Kagamin wrote:
> Weed Wrote:
> 
>>>> But why not allow this operation at the same speed that allows C++?
>>> If you pass it by value you'll lose polymorphism.
>> It is possible that this polymorphism is not needed and should be
>> prohibited for operations by value. The class is ready, why it should
>> not be used and have to redo it?
>>
>> Can not think about changing when the class is ready - he could have
>> enormous complexity and hierarchy.
> 
> It's probably already designed to be reference-type. I think, you'll have big troubles trying to change its semantic to value-type and effectively you'll have to redo it.

In other words, it is not always easy to translate C++ to D. It's 
probably not worthwhile to translate any large codebase into another 
programming language, in most cases, and if you do, you will probably 
need to rewrite large portions of it anyway.