On Monday, 16 March 2020 at 07:46:00 UTC, drug wrote:
On 3/16/20 10:11 AM, Ferhat Kurtulmuş wrote:
On Sunday, 15 March 2020 at 22:25:27 UTC, Arine wrote:
On Sunday, 15 March 2020 at 21:27:32 UTC, Ferhat Kurtulmuş
extern(C++, cv){
extern(C++, class) struct Size_(_Tp){
@disable this();
~this() { }
final _Tp area() const;
final double aspectRatio() const;
final bool empty() const;
_Tp width; //!< the width
_Tp height; //!< the height
}
}
extern(C++){
cv.Size_!int* createSizeIntWH(int w, int h);
}
void main()
{
Size_!int* sz = createSizeIntWH(200, 100);
writeln(sz.width);
}
This worked for me too. But member functions are still causing
linker error. It seems like docs
(https://dlang.org/spec/cpp_interface.html) do not cover those
situations. Is there any other sources to read for it. Maybe
you make a pull request to docs covering C++ interfacing tips
in detail.
Not tested:
extern(C++, class) struct Size_(_Tp){
@disable this();
~this() { }
extern(C++): // <- IIRC linkage should be set for members
separately from aggregate
final _Tp area() const;
final double aspectRatio() const;
final bool empty() const;
_Tp width; //!< the width
_Tp height; //!< the height
}
Ok, here is a solution. I opened my lib (yielded by my auxilary
cpp) using 7zip. There are two files containing symbol names,
1.txt and 2.txt. I searched for names of member functions. They
were not there because c++ compiler does not compile member
functions of class templates because we don't actually use them.
So, I simply include this line in my aux cpp file and recompiled
it:
template class cv::Size_<int>;
I reopened 1.txt and they are there now:
?area@?$Size_@H@cv@@QEBAHXZ
?aspectRatio@?$Size_@H@cv@@QEBANXZ
now everything works :D
