Converting a C string to wxString

[Marc de Kamps]

Hi,

I'm a novel user of wxGTK. I have to port some legacy code to the latest
version that we use here 2.8 on a FEDORA linux platform compiled with
Unicode support. The old code used version 2.4.2.

One of the main differences appear to be that there is no more implicit
conversion from (ANSI) C strings to wxString

I have read the documentation under Unicode:

- I understand that literals can be converted using the _T() macro and that
this will be expanded into the correct format whether one uses Unicode
support or not.

- I understand that when I need an ANSI C string, for example because it
needs to be converted to an STL string, I can use mb_str().

What I do not understand is how an ANSI C string that is not a literal
should be converted into a wxString, for example,
I've been passed an STL string str_example and apparently I need a converter
object to convert into a wxString object:

wxString wx_example(str_example.c_str(),*wxConvCurrent);

How do I do determine which converter I need? 

Thanks,
Marc