Re: [Swig-user] swig, std_vector.i, and C#

[William S F. <ws...@fu...>]

Wes Hodges wrote:
> hey all:
>  
> i have a question about std_vector.i and, unfortunately, time is of the 
> essence.  here's my situation:
>  
> in C++, i've have a function MyFunc defined in MyFile.h that takes 
> vector of MyClass* pointers as a parameter (MyClass is also defined in 
> MyFile.h).  i.e.:
>  
> void MyFunc(const std::vector<MyClass*>& objects)
>  
> now, here's the generated C# function i get when i SWIG MyFunc:
>  
> public void MyFunc(SWIGTYPE_P_std__vectorTMyClass_p_t objects)
>  
> seems to make sense.  MyClass_p i guess means a pointer to a MyClass 
> object, and the other _P_ probably means it treats the vector as a 
> pointer so it can handle it as an int.  ok.  now, i'm also using 
> std_vector.i, which, so far, looks like a fantastic piece of work.  i've 
> set up my SWIG .i file to use it as follows:
>  
> %module MyModule
>  
> %{
> #include "MyFile.h"
> %}
>  
> %include "std_string.i"    // I'm using this, not sure if it matters
> %include "std_vector.i"
>  
> namespace std {
>    %template(MyClassVector) vector<MyClass>;   // I guess this is right, 
> since vector<MyClass*> fails to build.  So, I'm assuming this is asking 
> for the C# version of MyClass.
> }
>  
> %include "MyFile.h"
>  
> in my C# code, i'm now free to use MyClassVector objects and interact 
> with them exactly as if they were ArrayList objects, and that's great.  
> but, if i try to do this in C#:
>  
> MyClassVector v = new MyClassVector( );
> MyClass o = new MyClass( );
>  
> v.Add(o);
>  
> MyFunc(v);    // Compile error - expecting 
> SWIGTYPE_P_std__vectorTMyClass_p_t, not MyClassVector
>  
> this also makes sense to me, because i guess i haven't told SWIG that 
> MyClassVector can be substituted for SWIGTYPE_P_std__vectorTMyClass_p_t, 
> and how it should do that substitution.  i was hoping that i was maybe 
> living in magic happy land where it was just done automatically for me. 
> :)  so, my question:  how do i tell SWIG to do that?  how do i get 
> MyFunc to take a MyClassVector object as a parameter?  typemaps?  again, 
> i'll take any reply i can get, as soon as i can get it.  i've got 12 
> hours before i have to go away for the next couple days...
>  
>  
The pointer reference typemaps you need still have to be added to SWIG. 
Meanwhile, you can get them from here:

http://mailman.cs.uchicago.edu/pipermail/swig/2004-November/010861.html

You might want to try using SWIGTYPE*& instead of the macro with CTYPE. 
This means it will work without using the macro, ie these typemaps will 
apply to all pointer references.

William