for_each: do not expose basic_string (implementation type)

[François Barel <frabar666@…>]

symbols<Char,T>::for_each's argument currently accepts two args:

(basic_string<Char>& str, T& val)

I know it's a slight interface change, but I think it should be changed to:

(Char const* str, T& val)

(i.e. change s into s.c_str() in f calls in tst_map.hpp and detail/tst.hpp), since:

1. if I'm not mistaken the API is Char const* everywhere else anyway (and basic_string is only used internally as a for_each implementation detail, but is not exposed anywhere else),

2. it lets the user do:

           sym1.for_each(symX.add);
           sym2.for_each(symX.add);
           sym3.for_each(symX.add);
           ...
   

to merge multiple symbol tables together, which is nicer than having to write a one-line functor around symX.add just to do the required c_str call.

Thanks, François

[François Barel <frabar666@…>]

Solved in Spirit2X SVN (r1090)