Calypso: Direct and full interfacing to C++

[Elie Morisse via Digitalmars-d-announce]

On Tuesday, 23 December 2014 at 15:20:18 UTC, Kagamin wrote:
> On Monday, 22 December 2014 at 23:14:44 UTC, Elie Morisse wrote:
>> • Structs
>> https://github.com/Syniurge/Calypso/blob/master/tests/calypso/showcase.d
>
>> testClass cls = new testInherit;
>
> This should be written
>
> testClass* cls = new testInherit;
>
> In C++ struct and class differ only in symbol mangling. They 
> are both value types, support inheritance, copy constructors 
> etc. By looking at the declaration you can't decide if a class 
> should be used as value type or reference type, so better treat 
> it as value type like in C++.

At the moment Calypso maps C++ POD records to D structs, and 
non-POD ones to D classes. But then it's true that this creates a 
conundrum because I can't translate class value types to D types, 
so currently functions that expect class value arguments are 
ignored.

Making C++ classes value types would have lots of implications, 
so the way I see it (for now, not sure if that's the best 
solution) I'll probably stick to D class semantics but I'll have 
to create C++-specific class value types to map C++ fields or 
functions that take class value arguments.