Struct default constructor - need some kind of solution for C++ interop

[deadalnix via Digitalmars-d]

On Wednesday, 7 September 2016 at 22:52:04 UTC, Walter Bright 
wrote:
> On 9/7/2016 2:08 PM, deadalnix wrote:
>> It is clear at this point that structures with obligatory 
>> initialization are
>> necessary. For C++ but not only.
>
> If not interfacing to C++, why?
>

I stated why.

> Is:
>
>     if (resource != null)
>         resource.destroy();
>
> v.s.:
>
>     resource.destroy();
>

In some cases yes. Consider reference counting for instance.

> so onerous? It's one TST/JNE pair for a value loaded into a 
> register anyway. And with a default constructor, there's all 
> that code added to deal with the constructor failing and 
> throwing.
>

One needs to construct anyway.