[C++-sig] Re: Builtin python functions and the Object Wrapper

[David Abrahams]

"Brian Hall" <bhall at gamers-fix.com> writes:

> Say I want to implement the following python code in C++ using the object
> wrapper:
>
>  
>
> def tb_lineno(tb):
>
>  
>
>     c = tb.tb_frame.f_code
>
>     if not hasattr(c, 'co_lnotab'):
>
>         return tb.tb_lineno
>
>  
>
>     tab = c.co_lnotab
>
>     line = c.co_firstlineno
>
>     stopat = tb.tb_lasti
>
>     addr = 0
>
>     for i in range(0, len(tab), 2):
>
>         addr = addr + ord(tab[i])
>
>         if addr > stopat:
>
>             break
>
>         line = line + ord(tab[i+1])
>
>     return line
>
>  
>
>  
>
> How would I gain access to the len() and ord() builtin methods?

There's nothing in the library for those, though there should be.
len() is x.attr("__len__")(), but I think you need to go directly to
the Python/C API for "ord" (I'm not sure).

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com