[C++-sig] converters

[Ralf W. Grosse-Kunstleve]

--- "Jacques A. Vidrine" <nectar at celabo.org> wrote:
> I'm having some difficulty due to the fact that conversions between
> the Python string type and std::string have NUL-terminated string
> semantics rather than the expected `opaque byte sequence' semantics.

What version of boost are you using? I thought this was fixed in 1.30.0.

> For my immediate needs, I thought I could simply substitute
> vector<char> and my own converters instead.  (Indeed, the API I'm
> wrapping uses vector<char> rather than std::string.)  I found that
> this was quite easy to do for returning values to Python:
> 
>    struct voc_to_str {
>         static PyObject *convert(const vector<char> v) {
>                 return PyString_FromStringAndSize(&v[0], v.size());
>         }
>    };
>    
>    to_python_converter<vector<char>, voc_to_str>();
> 
> but I don't quite see how one arranges for the opposite transformation
> (vector<char> -> python::str).

I am confused by "vector<char> -> python::str". Anyway, maybe this is useful:

http://mail.python.org/pipermail/c++-sig/2003-May/004133.html

A bit tedious but very powerful. See also the Boost.Python FAQ (I believe
question 2).

Ralf


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