Re: [Swig-user] Fwd: Pass parameters by reference in Swig

[Hassan M. <has...@ho...>]

david rodriguez martinez <davidrodriguez34 <at> gmail.com> writes:

> 
> 
> Hi all:My name is David Rodriguez, I'm from spain (Madrid).I'm working with 
swig but, I have a problem with my swig development.I have a function in C++ 
with parameter for refeneces ej: 
>    int solve_2nd_degree_eq(float a, float &x){    cout << x1<<a<<'\n';    
return 1; }When I create swig interfaz, I not to create the parameter for 
reference .
> 
>  
> "In my development, I have a error (EXception Pointer)."I search in 
tutorials and foro but nobody gives me a response.If your had the amiability 
to answer me, him been grateful.
>  wait for your response, a greetingPD: i am sorry for my bad english and 
Thank you in your time 
> 


Hi David

>From your email I think the problem is an exception thrown by python. 
As I explained before, create a pointer type for your float reference.
Also if you use "import example" in python then the method name must be fully 
qualified

example.solve_2nd_degree_eq(a,x)



/*example.i*/
%module example
%include "cpointer.i"
%pointer_class(float, floatP)

%{
#include "example.h"
%}

// Parse the original header file
%include "example.h"

... build your shared library as before then start python ...


python

>>>import example
>>>x=example.floatP()
>>>a=0.0;
>>>i=example.solve_2nd_degree_eq(a,x)
10
>>>i
1