basic_streambuf bug

[Dietmar Kuehl]

Hi,

--- Nathan Myers <ncm@cantrip.org> wrote:

>  		  int_type __c = this->uflow();  
>  		  if ( __c == traits_type::eof())
>  		    break;
> 
> 	      	  *__s++ = traits_type::to_char_type(__c);
>  		  ++__retval;

This is still broken: You cannot assume that 'operator==()' is the
right way to compare objects of 'int_type'. Likewise, you are supposed
to assign objects with 'traits_type::assign()':

            int_type __c = this->uflow(); // fine: copy ctor is there
            if (traits_type::eq_int_type(__c, traits_type::eof()))
              break;

            traits_type::assign(*__s++, traits_type::to_char_type(c));
            ++__retval;

Strict use of character traits is relatively hard because it is rather
tempting to use a short cut. I haven't created test cases identifying
these problems but I'm sure that I got it wrong in some places with my
implementation, too.

Regards,
  dk


=====
< mailto:dietmar_kuehl@yahoo.com >
< http://www.dietmar-kuehl.de/ >

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