Re: Deriving a D-class from a CPP-class
On Thursday, 29 April 2021 at 06:38:53 UTC, evilrat wrote: On Wednesday, 28 April 2021 at 19:46:00 UTC, Alain De Vos wrote: It is rather clear what I want to achieve but virtual functions give me headache because dlang does not now the word virtual. It's virtual by default. The opposite is `final`. by default, excepted if protection is private or package.
Re: Deriving a D-class from a CPP-class
On Wednesday, 28 April 2021 at 19:46:00 UTC, Alain De Vos wrote: It is rather clear what I want to achieve but virtual functions give me headache because dlang does not now the word virtual. It's virtual by default. The opposite is `final`.
Re: Deriving a D-class from a CPP-class
On Wednesday, 28 April 2021 at 19:46:00 UTC, Alain De Vos wrote:
Following code produces a linker error.
d: error: undefined symbol: wxApp::OnInit()
```
extern(C++)
{class wxApp {
public:
bool OnInit();
//virtual bool Oninit();
you mean `abstract` for that one?
alias OnInit=wxApp.OnInit;
idk what you intend to do with this, this pattern is for merging
overloads not overriding
bool OnInit(){return true;};
and you might want `override` there
Re: Deriving a D-class from a CPP-class
Following code produces a linker error.
d: error: undefined symbol: wxApp::OnInit()
```
extern(C++)
{class wxApp {
public:
bool OnInit();
//virtual bool Oninit();
}
}
class MYAPP: wxApp {
alias OnInit=wxApp.OnInit;
bool OnInit(){return true;};
}
int main(){
return 0;
}
```
It is rather clear what I want to achieve but virtual functions
give me headache because dlang does not now the word virtual.
Re: Deriving a D-class from a CPP-class
PS: I managed to link to phobo's/runtime & wxgtk at the same time. It goes like this [So someone does not need to re-invent the weel] ``` ldc2 - c test.d c++ test.o -o test -L/usr/local/lib -lphobos2-ldc -ldruntime-ldc -Wl,--gc-sections -lexecinfo -lpthread -lm -m64 `wxgtk3u-3.0-config --cxxflags --libs` ```
Deriving a D-class from a CPP-class
Is it ok to do the following ?
I.e. derive a D-class from a CPP-class.
The compiler did not complained, and it was OK for him.
```
c++ -c MyClass.cpp
ldc2 main.d MyClass.o -L-lstdc++
```
```
extern(C++){
class MyClass {
public:
int num=1;
void myMethod();
};
};
class Derived : MyClass{
};
int main(){
Derived myObj;
myObj.myMethod();
return 0;
}
```
Could I use this method for using the C++-WXWIDGETS library
directly?
