Making strings of arbitrary character types

[Paolo Carlini]

Paolo Carlini wrote:

> I suggest taking inspiration from the snippet present in our 
> testsuite, in particular:
>
>    testsuite/27_io/basic_filebuf/seekoff/wchar_t/12790*.cc

Sorry, of course I meant (no wchar_t involved!):

    testsuite/27_io/basic_filebuf/seekoff/12790*.cc
    + testsuite_character.h

Paolo.