[Bf-committers] How to mix C and C++ in Blender

[Jürgen Herrmann]

Hi Alexander,

I personally don't like this, but it is possible:

http://stackoverflow.com/questions/7281441/elegantly-call-c-from-c
http://stackoverflow.com/questions/2399344/calling-c-code-from-c
http://stackoverflow.com/questions/2744181/how-to-call-c-function-from-c

Google is your friend ;) Sometimes...

I don't know exactly what the blender coding conventions say about this, but I would consider this bad style, because you have to introduce wrappers that might easily break when a external lib is updated.
I am curious what the other devs say ;)

/Jürgen

Am 18.06.2013 um 23:02 schrieb Alexander Pinzon Fernandez <apinzonf at gmail.com>:

> Hi all.
> 
> I am working on Bmesh operator for perform laplacian editing for sketch
> mesh gsoc project.
> 
> If the library to solve the linear system is SuperLU and Eigen3 for matrix
> operations, then I must learn how to mix C code (SuperLU) and C ++ (Eigen3)
> in Blender. (elegant and organized way).
> 
> I have c code file in
> source\blender\bmesh\operators\bmo_deform_laplacian.c
> in bmo_deform_laplacian.c i call several c++ functions (ej. au = ftest(4
> ,5);) declare in bmo_deform_utils.h  and implemented in
> bmo_deform_utils.cpp.
> 
> this two files are in source\blender\bmesh\operators\
> 
> What are the directories where the files should put  bmo_deform_utils.h
> and bmo_deform_utils.cpp?
> What are policies and style guides in Blender to mix C code and C ++?
> 
> Example
> 
> bmo_deform_laplacian.c
> //////////////////////////////////////
> ....
> #Include "bmo_deform_utils.h"
> ...
> au = ftest(4 ,5);
> ...
> ///////////////////////////////////////
> 
> bmo_deform_utils.h
> ///////////////////////////////////////
> #ifndef __BMO_DEFORM_UTILS_H__
> #define __BMO_DEFORM_UTILS_H__
> 
> 
> #ifdef __cplusplus
> extern "C" {
> #endif
> 
> int ftest(int x, int y);
> 
> #ifdef __cplusplus
> };
> #endif
> 
> #endif //__BMO_DEFORM_UTILS_H__
> ///////////////////////////////////////
> 
> bmo_deform_utils.cpp
> ///////////////////////////////////////////
> 
> #include "bmo_deform_utils.h"
> 
> class ABC{
> public:
> int a,b;
> ABC(int ax, int by ){
> a = ax;
> b = by;
> }
> int fsum(){
> return a + b;
> }
> };
> 
> int  ftest(int x, int y){
> ABC A(x, y);
> return A.fsum();
> }
> ///////////////////////////////////////////
> 
> Thanks in advance.
> 
> Att
> Alexander Pinzon Fernandez
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