[C++-sig] Wrapping out parameter for python access

[Roman Yakovenko]

On 10/22/07, Chang Chen <Chang_Chen at sonic.com> wrote:
>
> Hi all
>
> This is a classical issue in boost python. I.e. removeing an argument
> from the function definition and adding the "returned", by the original
> function, value to the return statement of the function-wrapper
>
> For example :
>
> The original function is:
>
> inline void hello_world( std::string& hw ){
>     hw = "hello world!";
> }
>
> And the wrapper is:
>
> inline std::string hello_world_wrapper()
> {
>         std:string temp;
>         ::hello_world(temp);
>         Return temp;
> }
>
> Py++ can help us to generate such wrapper, see
> http://language-binding.net/pyplusplus/documentation/functions/transform
> ation/built_in/output.html
>
> But in this thread
> (http://mail.python.org/pipermail/c++-sig/2005-June/009097.html ), Dave
> provided a start to write a wrapping template.
>
> In My case, only last parameter is out parameter and whether function
> parameter count does not matter. The function signature looks like:
>
> Return function (T1 t1, T2 t2, TOUT& out);
>
> How to write a template for such function and integrate into def?
>
> Any suggestion?


I attach the complete solution to the problem including build script and
unittest.

The key for solution is to use boost::bind library.

P.S. anyone with good knowledge of MPL & PPL, and some free time :-),  is
welcome to improve the code

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/
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