On 2018-05-01 16:07:30 +0000, Timoses said:
On Tuesday, 1 May 2018 at 15:24:09 UTC, Robert M. Münch wrote:
Hi, I'm mostly doing simple C-API wrappers around C++ code to access
thigns from D. However, I wanted to try how far I can come using C++
directly.
I have the following C++ code in namespace N:
class Image : public Object {
Error create(int w, int h, uint32_t p) noexcept;
}
And I have the following D code:
extern (C++, N) {
class Object {
}
class Image : public Object {
uint create(int w, int h, uint pixelFormat);
}
}
So frist problem I see is, that a C++ class names Object is pretty
unfortunate as this is a reserved class name in D. And DMD doesn't seem
to allow using Object inside a C++ scope (which IMO should be possible).
Am I right, that there is no chance to handle this case other than
ranming the C++ base class?
Would `pragma(mangle, ...)` work here?
https://dlang.org/spec/pragma.html#mangle
Yes, great! Thanks. I could extend the code now. But I get a next problem:
extern (C++, b2d) {
class AnyBase {
bool isShared();
}
pragma(mangle, "Object");
class b2dObject : AnyBase {
}
class Image : b2dObject {
// class Image {
uint create(int w, int h, uint pixelFormat);
}
}
The linke complains about missing symbols:
error LNK2001: "public: virtual bool __cdecl
b2d::AnyBase::isShared(void)" (?isShared@AnyBase@b2d@@UEBA_NXZ)
error LNK2001: "public: virtual unsigned int __cdecl
b2d::Image::create(int,int,unsigned int)"
(?create@Image@b2d@@UEAAIHHI@Z)
I have in my C++ link lib:
?isShared@AnyBase@b2d@@QEBA_NXZ which demangles to => public: BOOL
__cdecl b2d::AnyBase::isShared(void)const __ptr64
So, the difference is the "virtual" specifier on the D side, while the
C++ mangeling is missing this. I have this for many functions.
Any idea how to handle this?
--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster
